diff --git a/tools/check-formatting.sh b/tools/check-formatting.sh
index 5e5699d5..9be40812 100755
--- a/tools/check-formatting.sh
+++ b/tools/check-formatting.sh
@@ -14,7 +14,7 @@ for f in ${SOURCES[@]}
 do
     clang-format -n $f 2>&1 | grep -q ^
     RESULT=$?
-    if [ "$RESULT" = "0" ]
+    if [ "$RESULT" -eq "0" ]
     then
         echo "File $f needs formatting"
         ALL_OK=0