diff --git a/scripts/check_c_formatting.sh b/scripts/check_c_formatting.sh
index b4fa9be3..5c70575c 100755
--- a/scripts/check_c_formatting.sh
+++ b/scripts/check_c_formatting.sh
@@ -13,7 +13,7 @@ set -e
 ARGUMENT="--dry-run"
 
 if [ $# -eq 1 ]; then
-    if [ "$1" == "-f" ]; then
+    if [ "$1" = "-f" ]; then
         echo "Fixing files in place if necessary"
         ARGUMENT="-i"
     else