diff --git a/ThirdParty/rpmBuild/SPECS/ParMGridGen-1.0.spec b/ThirdParty/rpmBuild/SPECS/ParMGridGen-1.0.spec
index d52fc4073..3d378cac5 100644
--- a/ThirdParty/rpmBuild/SPECS/ParMGridGen-1.0.spec
+++ b/ThirdParty/rpmBuild/SPECS/ParMGridGen-1.0.spec
@@ -106,7 +106,7 @@ fi
     [ -n "$WM_LDFLAGS" ]    &&  export LDFLAGS="$WM_LDFLAGS"
     [ -z "$WM_NCOMPPROCS" ] && WM_NCOMPPROCS=1
 
-    make -j $WM_NCOMPPROCS CC=$CC
+    make -j $WM_NCOMPPROCS CC="$WM_CC"
 
 %install
     # Manual installation
diff --git a/ThirdParty/rpmBuild/SPECS/metis-5.1.0.spec b/ThirdParty/rpmBuild/SPECS/metis-5.1.0.spec
index f115d27ba..88ee4c8ca 100644
--- a/ThirdParty/rpmBuild/SPECS/metis-5.1.0.spec
+++ b/ThirdParty/rpmBuild/SPECS/metis-5.1.0.spec
@@ -109,10 +109,10 @@ fi
 %ifos darwin
     make config
     # The parameter -D_POSIX_C_SOURCE=200809 has a side effect on Mac OS X
-    make -j $WM_NCOMPPROCS OPTFLAGS="-O3 -fPIC" CC=$CC
+    make -j $WM_NCOMPPROCS OPTFLAGS="-O3 -fPIC" CC="$CC"
 %else
     make config
-    make -j $WM_NCOMPPROCS OPTFLAGS="-O3 -fPIC -D_POSIX_C_SOURCE=200809" CC=$CC
+    make -j $WM_NCOMPPROCS OPTFLAGS="-O3 -fPIC -D_POSIX_C_SOURCE=200809" CC="$CC"
 %endif
 
 %install