diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index b3af917..98ce18e 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -119,7 +119,7 @@ jobs:
 
     - name: "Check code formatting [Black]"
       run: |
-        black --check --diff --quiet .
+        black --check --diff ./src ./tests
 
     - name: "Run tests"
       env: