diff --git a/.github/workflows/selenium-lab-tests.yaml b/.github/workflows/selenium-lab-tests.yaml
index 9ef58d07ad..56bf6d9b3e 100644
--- a/.github/workflows/selenium-lab-tests.yaml
+++ b/.github/workflows/selenium-lab-tests.yaml
@@ -211,8 +211,9 @@ jobs:
 
     # Only one run of this job is allowed at a time, since it uses physical
     # resources in our lab.
-    concurrency: selenium-lab-${{ matrix.browser }}
-    cancel-in-progress: false
+    concurrency:
+      group: selenium-lab-${{ matrix.browser }}
+      cancel-in-progress: false
 
     needs: [compute-sha, build-shaka, matrix-config]
     strategy: