diff --git a/test.sh b/test.sh
index 16f2966..de36748 100755
--- a/test.sh
+++ b/test.sh
@@ -18,7 +18,7 @@ do_test() {
   is=$($bin "$name")
   is="$is:$?"
 
-  if [ "$is" == "$should" ]; then
+  if [ "$is" = "$should" ]; then
     echo "Test $1 success"
   else
     echo "Test $1 fail: \"${bin##*/} $name\" returned \"$is\" instead of \"$should\""