diff --git a/openscad.pro b/openscad.pro
index ea6f03b0..4613de73 100644
--- a/openscad.pro
+++ b/openscad.pro
@@ -61,8 +61,6 @@ else {
   INCLUDEPATH += /usr/include/eigen2
 }
 
-!macx:QMAKE_CXXFLAGS_RELEASE = -O3 -march=pentium
-
 # QMAKE_CFLAGS   += -pg
 # QMAKE_CXXFLAGS += -pg
 # QMAKE_LFLAGS   += -pg
diff --git a/scripts/release-linux.sh b/scripts/release-linux.sh
index edb79ebc..2de7b861 100755
--- a/scripts/release-linux.sh
+++ b/scripts/release-linux.sh
@@ -7,7 +7,7 @@ set -ex
 
 # svnclean
 
-qmake-qt4 VERSION=$VERSION
+qmake-qt4 VERSION=$VERSION QMAKE_CXXFLAGS_RELEASE="-O3 -march=pentium"
 make
 
 rm -rf release