diff --git a/rancher-turtles-airgap-resources-chart/_service b/rancher-turtles-airgap-resources-chart/_service
index c5ba7bc..399e403 100644
--- a/rancher-turtles-airgap-resources-chart/_service
+++ b/rancher-turtles-airgap-resources-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">CHART_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?img_prefix})</param>
+    <param name="eval">CHART_PREFIX=$(rpm --macros=/root/.rpmmacros -E %{?chart_prefix})</param>
     <param name="var">CHART_PREFIX</param>
     <param name="eval">CHART_MAJOR=$(rpm --macros=/root/.rpmmacros -E %{?chart_major})</param>
     <param name="var">CHART_MAJOR</param>