diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e8830775..ac931aa3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,6 +22,7 @@ jobs:
         with:
           fetch-depth: 0
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: <fork-owner>/<fork-repo>
 
       - name: Set up Python ${{ env.min-python-version }}
         uses: actions/setup-python@v2
@@ -64,6 +65,7 @@ jobs:
         with:
           fetch-depth: 0
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: <fork-owner>/<fork-repo>
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2