diff --git a/hooks/tests/test-run-fmt.sh b/hooks/tests/test-run-fmt.sh
index 23906ad4be9..1127438b1e4 100755
--- a/hooks/tests/test-run-fmt.sh
+++ b/hooks/tests/test-run-fmt.sh
@@ -29,7 +29,7 @@ mock_staged() {
 case "\$*" in
     "diff --staged --name-only HEAD --diff-filter=ACMR")
         printf '%s\n' $files ;;
-    "diff --name-only")
+    "diff --name-only"|"diff --name-only --diff-filter=ACMR")
         ;;  # no unstaged changes
     add\ *)
         echo "\$*" >> "$GIT_ADD_CALLS" ;;