diff --git a/.github/workflows/testmerge.yml b/.github/workflows/testmerge.yml
index 4df30e6a824..1bd4787035b 100644
--- a/.github/workflows/testmerge.yml
+++ b/.github/workflows/testmerge.yml
@@ -68,7 +68,8 @@ jobs:
         uses: actions/checkout@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          fetch-depth: 0
+          fetch-depth: 2147483647
+          clean: false
           ref: ${{ env.BASE_BRANCH }}
 
       - uses: actions/setup-python@v5