diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 9127bf7..d514154 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -34,7 +34,7 @@ jobs:
         black . --check --diff
     - name: Static type test with mypy
       run: |
-        mypy
+        mypy -p waybackpy -p tests
     - name: Test with pytest
       run: |
         pytest
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29