diff --git a/utils/setVersionNumber.sh b/utils/setVersionNumber.sh
index ae14a97..ce73d42 100755
--- a/utils/setVersionNumber.sh
+++ b/utils/setVersionNumber.sh
@@ -20,10 +20,10 @@ oldversion=`cat VERSION`
 
 echo "Changing version from $oldversion to $version"
 
-sed -i "s/__version__ = '$oldversion'/__version__ = '$version'/g" python/src/__init__.py
+sed -i'.bak' "s/__version__ = '$oldversion'/__version__ = '$version'/g" python/src/__init__.py
 
-sed -i "s/Version:        $oldversion/Version:        $version/g" distro/rpm/*.spec
-sed -i "s/ ($oldversion-/ ($version-/g" distro/debian/changelog
+sed -i'.bak' "s/Version:        $oldversion/Version:        $version/g" distro/rpm/*.spec
+sed -i'.bak' "s/ ($oldversion-/ ($version-/g" distro/debian/changelog
 
 oldmajor=`echo $oldversion | cut -d "." -f 1`
 oldminor=`echo $oldversion | cut -d "." -f 2`
@@ -32,13 +32,13 @@ major=`echo $version | cut -d "." -f 1`
 minor=`echo $version | cut -d "." -f 2`
 patch=`echo $version | cut -d "." -f 3`
 
-sed -i "s/CPACK_PACKAGE_VERSION_MAJOR $oldmajor/CPACK_PACKAGE_VERSION_MAJOR $major/g" CMakeLists.txt
-sed -i "s/CPACK_PACKAGE_VERSION_MINOR $oldminor/CPACK_PACKAGE_VERSION_MINOR $minor/g" CMakeLists.txt
+sed -i'.bak' "s/CPACK_PACKAGE_VERSION_MAJOR $oldmajor/CPACK_PACKAGE_VERSION_MAJOR $major/g" CMakeLists.txt
+sed -i'.bak' "s/CPACK_PACKAGE_VERSION_MINOR $oldminor/CPACK_PACKAGE_VERSION_MINOR $minor/g" CMakeLists.txt
 
 number_of_dots=`grep -o '\.' <<< $version | wc -l`
 if test $number_of_dots -ge 2
 then
-  sed -i "s/set ( CPACK_PACKAGE_VERSION_PATCH $oldpatch/set ( CPACK_PACKAGE_VERSION_PATCH $patch/g" CMakeLists.txt
+  sed -i'.bak' "s/set ( CPACK_PACKAGE_VERSION_PATCH $oldpatch/set ( CPACK_PACKAGE_VERSION_PATCH $patch/g" CMakeLists.txt
 fi
 
 echo $version > VERSION