diff --git a/.github/workflows/run-unit-tests.yml b/.github/workflows/run-unit-tests.yml
index cc6215b..2bf55b5 100644
--- a/.github/workflows/run-unit-tests.yml
+++ b/.github/workflows/run-unit-tests.yml
@@ -9,7 +9,7 @@ on:
       - "**"
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.head.ref || github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.head.sha || github.sha }}
   cancel-in-progress: true
 
 jobs: