diff --git a/.github/workflows/e2e-ios.yml b/.github/workflows/e2e-ios.yml
index 3e92c3af..5ce8249c 100644
--- a/.github/workflows/e2e-ios.yml
+++ b/.github/workflows/e2e-ios.yml
@@ -44,7 +44,8 @@ on:
     types: [published]
 
 concurrency:
-  group: e2e-ios-${{ github.ref }}
+  # Per branch and set of legs: a perf run doesn't cancel a feature run.
+  group: e2e-ios-${{ github.ref }}-${{ inputs.legs || 'all' }}
   cancel-in-progress: true
 
 env: