diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index be8cb28..923125b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
 
       - name: Check typing
         run: |
-          python -m mypy
+          python -m mypy src
 
       - name: Test
         run: |