diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 7ac728b57..2dd781f61 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -3,6 +3,7 @@ name: benchmarks
 on:
   workflow_dispatch:
   pull_request:
+    branches: [master]
 
 concurrency: 
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}