diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 8e639fd9..965eb2f0 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -25,3 +25,7 @@ jobs:
       run: |
         pip install pytest
         pytest
+    - name: Test formatting
+        run: |
+          pip install black
+          black --check .