diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 896d0fc..ec8b712 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -39,11 +39,11 @@ jobs:
 
       - name: Generate coverage.json
         run: |
-          python -m coverage json --include=$(git diff --name-status main codebasin/*.py | grep "^M" | awk '{ print $2 }' | paste -sd,)
+          python -m coverage json --include=$(git diff --name-status ${{ github.event.pull_request.base.sha }} codebasin/*.py | grep "^M" | awk '{ print $2 }' | paste -sd,)
 
       - name: Check coverage against latest commits
         run: |
           FROM=${{ github.event.pull_request.base.sha }}
-          TO=${{ github.event.pull_request.head.sha }}
+          TO=${{ github.sha }}
           COMMITS=$(git rev-list $FROM..$TO)
           python .github/workflows/check-coverage.py coverage.json --commits $COMMITS