diff --git a/_constraints b/_constraints
index 3f1bd93..270af33 100644
--- a/_constraints
+++ b/_constraints
@@ -11,4 +11,15 @@
       <size unit="M">1300</size>
     </memoryperjob>
   </hardware>
+  <overwrite>
+    <conditions>
+      <arch>ppc64</arch>
+      <arch>ppc64le</arch>
+    </conditions>
+    <hardware>
+    <memoryperjob>
+      <size unit="M">0</size>
+    </memoryperjob>
+    </hardware>
+  </overwrite>
 </constraints>
diff --git a/qgis.changes b/qgis.changes
index 9f34b3e..b50c8e3 100644
--- a/qgis.changes
+++ b/qgis.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Sep 16 15:37:24 UTC 2020 - Michel Normand <normand@linux.vnet.ibm.com>
+
+- for ppc64le put back limit_build to avoid OOM failure and
+  unset memoryperjob that did not solve the OOM failure.
+
 -------------------------------------------------------------------
 Tue Sep 15 12:12:24 UTC 2020 - Dirk Stoecker <opensuse@dstoecker.de>
 
diff --git a/qgis.spec b/qgis.spec
index 632cce2..f4d14e5 100644
--- a/qgis.spec
+++ b/qgis.spec
@@ -140,6 +140,7 @@ Obsoletes:      qgis2
 BuildRequires:  grass-devel >= 7.2
 %endif
 %ifarch ppc64le
+BuildRequires:  memory-constraints
 %endif
 
 %package devel
@@ -223,6 +224,7 @@ export QTDIR=%{_prefix}
 export PATH=$PATH:$QTDIR/bin
 %ifarch ppc64le
 # avoid OOM failure on power8-01 builder
+%limit_build -m 1300
 %endif
 %make_jobs