diff --git a/.github/workflows/formatter.yaml b/.github/workflows/formatter.yaml
index 235f2e4b..12c735fb 100644
--- a/.github/workflows/formatter.yaml
+++ b/.github/workflows/formatter.yaml
@@ -34,4 +34,4 @@ jobs:
       run: isort --check-only .
 
     - name: Run black
-      run: black --diff .
+      run: black --check --diff .