diff --git a/akri-chart/_service b/akri-chart/_service
index c3f6878..4f6fb26 100644
--- a/akri-chart/_service
+++ b/akri-chart/_service
@@ -2,14 +2,14 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">values.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/akri-controller-image/_service b/akri-controller-image/_service
index 7e6a968..ea2d98f 100644
--- a/akri-controller-image/_service
+++ b/akri-controller-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/akri-dashboard-extension-chart/_service b/akri-dashboard-extension-chart/_service
index c3f6878..4f6fb26 100644
--- a/akri-dashboard-extension-chart/_service
+++ b/akri-dashboard-extension-chart/_service
@@ -2,14 +2,14 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">values.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/akri-debug-echo-discovery-handler-image/_service b/akri-debug-echo-discovery-handler-image/_service
index f71bb0e..0c59588 100644
--- a/akri-debug-echo-discovery-handler-image/_service
+++ b/akri-debug-echo-discovery-handler-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/akri-onvif-discovery-handler-image/_service b/akri-onvif-discovery-handler-image/_service
index 78d5714..eae3b96 100644
--- a/akri-onvif-discovery-handler-image/_service
+++ b/akri-onvif-discovery-handler-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/akri-opcua-discovery-handler-image/_service b/akri-opcua-discovery-handler-image/_service
index f8c69a7..5b8490d 100644
--- a/akri-opcua-discovery-handler-image/_service
+++ b/akri-opcua-discovery-handler-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/akri-udev-discovery-handler-image/_service b/akri-udev-discovery-handler-image/_service
index f620ac7..14e3e74 100644
--- a/akri-udev-discovery-handler-image/_service
+++ b/akri-udev-discovery-handler-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/akri-webhook-configuration-image/_service b/akri-webhook-configuration-image/_service
index 89f09e9..c13ae64 100644
--- a/akri-webhook-configuration-image/_service
+++ b/akri-webhook-configuration-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/baremetal-operator-image/_service b/baremetal-operator-image/_service
index 88c8e8c..b940a24 100644
--- a/baremetal-operator-image/_service
+++ b/baremetal-operator-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/cdi-chart/_service b/cdi-chart/_service
index 6b8f891..415ab01 100644
--- a/cdi-chart/_service
+++ b/cdi-chart/_service
@@ -2,7 +2,7 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/cluster-api-controller-image/_service b/cluster-api-controller-image/_service
index 05f906c..cd89c9b 100644
--- a/cluster-api-controller-image/_service
+++ b/cluster-api-controller-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/cluster-api-operator-image/_service b/cluster-api-operator-image/_service
index 1edc617..a03dec2 100644
--- a/cluster-api-operator-image/_service
+++ b/cluster-api-operator-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/cluster-api-provider-metal3-image/_service b/cluster-api-provider-metal3-image/_service
index ec4e439..88b377a 100644
--- a/cluster-api-provider-metal3-image/_service
+++ b/cluster-api-provider-metal3-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/cluster-api-provider-rke2-bootstrap-image/_service b/cluster-api-provider-rke2-bootstrap-image/_service
index 430aa7c..d3ad628 100644
--- a/cluster-api-provider-rke2-bootstrap-image/_service
+++ b/cluster-api-provider-rke2-bootstrap-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/cluster-api-provider-rke2-controlplane-image/_service b/cluster-api-provider-rke2-controlplane-image/_service
index 1fbc59e..7262db3 100644
--- a/cluster-api-provider-rke2-controlplane-image/_service
+++ b/cluster-api-provider-rke2-controlplane-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/edge-image-builder-image/_service b/edge-image-builder-image/_service
index 3990297..5e4e6b4 100644
--- a/edge-image-builder-image/_service
+++ b/edge-image-builder-image/_service
@@ -2,7 +2,7 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/endpoint-copier-operator-chart/_service b/endpoint-copier-operator-chart/_service
index c3f6878..4f6fb26 100644
--- a/endpoint-copier-operator-chart/_service
+++ b/endpoint-copier-operator-chart/_service
@@ -2,14 +2,14 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">values.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/endpoint-copier-operator-image/_service b/endpoint-copier-operator-image/_service
index e2ff368..4c01db8 100644
--- a/endpoint-copier-operator-image/_service
+++ b/endpoint-copier-operator-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/ip-address-manager-image/_service b/ip-address-manager-image/_service
index 56cf294..aa55602 100644
--- a/ip-address-manager-image/_service
+++ b/ip-address-manager-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/ironic-image/_service b/ironic-image/_service
index 219c79f..3b947dd 100644
--- a/ironic-image/_service
+++ b/ironic-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/ironic-ipa-downloader-image/_service b/ironic-ipa-downloader-image/_service
index 3480bd2..8dede4f 100644
--- a/ironic-ipa-downloader-image/_service
+++ b/ironic-ipa-downloader-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/metal3-chart/_service b/metal3-chart/_service
index c3f6878..4f6fb26 100644
--- a/metal3-chart/_service
+++ b/metal3-chart/_service
@@ -2,14 +2,14 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">values.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/metallb-chart/_service b/metallb-chart/_service
index c3f6878..4f6fb26 100644
--- a/metallb-chart/_service
+++ b/metallb-chart/_service
@@ -2,14 +2,14 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">values.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/metallb-controller-image/_service b/metallb-controller-image/_service
index 11af884..e8cb52e 100644
--- a/metallb-controller-image/_service
+++ b/metallb-controller-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/metallb-speaker-image/_service b/metallb-speaker-image/_service
index 1ed0813..ab9087f 100644
--- a/metallb-speaker-image/_service
+++ b/metallb-speaker-image/_service
@@ -9,7 +9,7 @@
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
diff --git a/sriov-crd-chart/_service b/sriov-crd-chart/_service
index 6b8f891..415ab01 100644
--- a/sriov-crd-chart/_service
+++ b/sriov-crd-chart/_service
@@ -2,7 +2,7 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/sriov-network-operator-chart/_service b/sriov-network-operator-chart/_service
index 6b8f891..415ab01 100644
--- a/sriov-network-operator-chart/_service
+++ b/sriov-network-operator-chart/_service
@@ -2,7 +2,7 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/upgrade-controller-chart/_service b/upgrade-controller-chart/_service
index 3cd1d17..d43430b 100644
--- a/upgrade-controller-chart/_service
+++ b/upgrade-controller-chart/_service
@@ -2,14 +2,14 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">values.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>
   </service>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Chart.yaml</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
   </service>
 </services>
diff --git a/upgrade-controller-image/_service b/upgrade-controller-image/_service
index 0041dd1..ed45bd6 100644
--- a/upgrade-controller-image/_service
+++ b/upgrade-controller-image/_service
@@ -2,7 +2,7 @@
   <service mode="buildtime" name="kiwi_metainfo_helper"/>
   <service name="replace_using_env" mode="buildtime">
     <param name="file">Dockerfile</param>
-    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %img_prefix)</param>
+    <param name="eval">IMG_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
     <param name="var">IMG_PREFIX</param>
     <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
     <param name="var">IMG_REPO</param>