diff --git a/build-scripts/showrev.sh b/build-scripts/showrev.sh
index 788d7ef2f..d3b131a14 100755
--- a/build-scripts/showrev.sh
+++ b/build-scripts/showrev.sh
@@ -7,7 +7,7 @@ cd $SDL_ROOT
 
 if [ -x "$(command -v hg)" ]; then
     rev="$(hg parents --template 'hg-{rev}:{node|short}' 2>/dev/null)"
-    if [ "$?" == 0 ]; then
+    if [ $? = 0 ]; then
         echo $rev
         exit 0
     fi
@@ -15,7 +15,7 @@ fi
 
 if [ -x "$(command -v p4)" ]; then
     rev="$(p4 changes -m1 ./...\#have 2>/dev/null| awk '{print $2}')"
-    if [ "$?" == 0 ]; then
+    if [ $? = 0 ]; then
         echo $rev
         exit 0
     fi