diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2716e7f792..c472709bc8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -2,7 +2,7 @@ name: CI
 # https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#concurrency
 # https://docs.github.com/en/developers/webhooks-and-events/events/github-event-types#pullrequestevent
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.number }}-${{ github.event.type }}
+  group: ${{ github.workflow }}-${{ github.event.number || github.event.ref }}-${{ github.event.type }}
   cancel-in-progress: true
 
 on: [push, pull_request]