diff --git a/version.sh b/version.sh
index f45c60daae..3269e038a7 100755
--- a/version.sh
+++ b/version.sh
@@ -2,32 +2,32 @@
 
 # check for SVN revision number
 revision=$(cd "$1" && cat snapshot_version 2> /dev/null)
-test $revision || revision=$(cd "$1" && LC_ALL=C svn info 2> /dev/null | grep "Last Changed Rev" | cut -d' ' -f4)
-test $revision || revision=$(cd "$1" && grep committed-rev .svn/entries 2>/dev/null | head -n 1 | cut -d '"' -f2)
-test $revision || revision=$(cd "$1" && sed -n -e '/^dir$/{n
+test "$revision" || revision=$(cd "$1" && LC_ALL=C svn info 2> /dev/null | grep "Last Changed Rev" | cut -d' ' -f4)
+test "$revision" || revision=$(cd "$1" && grep committed-rev .svn/entries 2>/dev/null | head -n 1 | cut -d '"' -f2)
+test "$revision" || revision=$(cd "$1" && sed -n -e '/^dir$/{n
 p
 q
 }' .svn/entries 2>/dev/null)
-test $revision && revision=SVN-r$revision
+test "$revision" && revision=SVN-r$revision
 
 # check for git svn revision number
-if ! test $revision; then
+if ! test "$revision"; then
     revision=$(cd "$1" && git svn find-rev HEAD 2> /dev/null)
-    test $revision && revision=git-svn-r$revision
+    test "$revision" && revision=git-svn-r$revision
 fi
 
 # check for git short hash
-if ! test $revision; then
+if ! test "$revision"; then
     revision=$(cd "$1" && git describe --always 2> /dev/null)
-    test $revision && revision=git-$revision
+    test "$revision" && revision=git-$revision
 fi
 
 # no revision number found
-test $revision || revision=UNKNOWN
+test "$revision" || revision=UNKNOWN
 
 # releases extract the version number from the VERSION file
 version=$(cd "$1" && cat VERSION 2> /dev/null)
-test $version || version=$revision
+test "$version" || version=$revision
 
 test -n "$3" && version=$version-$3