diff --git a/.github/workflows/diff.yml b/.github/workflows/diff.yml
index 3db66357d..938892349 100644
--- a/.github/workflows/diff.yml
+++ b/.github/workflows/diff.yml
@@ -10,7 +10,7 @@ env:
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   branch_status:
-    if: ${{ github.event.issue.pull_request }}
+    if: ${{ github.event.issue.pull_request && github.event.issue.state == 'open' }}
     runs-on: ubuntu-latest
     permissions:
       contents: read