diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d58987..438c069 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,4 +43,4 @@ jobs:
         run: |
           whatchanged --version
           whatchanged --help
-          whatchanged
+          whatchanged HEAD~