diff --git a/version.sh b/version.sh
index 1125798eda..f76ab454e7 100755
--- a/version.sh
+++ b/version.sh
@@ -10,7 +10,7 @@ elif test `uname -s` = 'Darwin' ; then
 fi
 
 extra=""
-if test $1 ; then
+if test "$1" ; then
  extra="-$1"
 fi
 echo "#define VERSION \"CVS-${last_cvs_update}${extra} \"" >version.h