diff --git a/.github/workflows/eval.yml b/.github/workflows/eval.yml
index bec9c23de6a0..3acfbdf25e37 100644
--- a/.github/workflows/eval.yml
+++ b/.github/workflows/eval.yml
@@ -101,7 +101,6 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           ref: ${{ needs.prepare.outputs.mergedSha }}
-          fetch-depth: 2
           path: nixpkgs
 
       - name: Install Nix
@@ -168,6 +167,7 @@ jobs:
         env:
           AUTHOR_ID: ${{ github.event.pull_request.user.id }}
         run: |
+          git -C nixpkgs fetch --depth 1 origin ${{ needs.prepare.outputs.targetSha }}
           git -C nixpkgs worktree add ../target ${{ needs.prepare.outputs.targetSha }}
           git -C nixpkgs diff --name-only ${{ needs.prepare.outputs.targetSha }} \
             | jq --raw-input --slurp 'split("\n")[:-1]' > touched-files.json