diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index cce614221..61005af2d 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -17,7 +17,7 @@ jobs:
         id: files
         run: |
           ANY_CHANGED=false
-          ALL_CHANGED_FILES=$(git diff --name-only master HEAD -- streams/ | tr '\n' ' ')
+          ALL_CHANGED_FILES=$(git diff --name-only origin/${{ github.base_ref }}..${{ github.sha }} -- streams/ | tr '\n' ' ')
           if [ -n "${ALL_CHANGED_FILES}" ]; then
             ANY_CHANGED=true
           fi