diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 5c48852..488e403 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -23,7 +23,7 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          existing_pr=$(gh pr list --repo ${{ github.repository }} --head "auto-update-flake-" --state open --json number --jq '.[0].number')
+          existing_pr=$(gh pr list --repo ${{ github.repository }} --state open --json number,headRefName --jq '.[] | select(.headRefName | startswith("auto-update-flake")) | .number' | head -n1)
           echo "$existing_pr"
           if [ -n "$existing_pr" ]; then
             echo "pr_exists=true" >> $GITHUB_OUTPUT