diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dcf7e0f..5adbabd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2.3.4
+        with:
+          fetch-depth: 2
       - name: Install indent
         run: sudo apt install indent
       - name: Run format check