diff --git a/.github/workflows/sizediff.yml b/.github/workflows/sizediff.yml
index 38fa5335..4d7fc3a3 100644
--- a/.github/workflows/sizediff.yml
+++ b/.github/workflows/sizediff.yml
@@ -10,6 +10,8 @@ concurrency:
 jobs:
   sizediff:
     runs-on: ubuntu-22.04
+    permissions:
+      pull-requests: write
     steps:
       # Prepare, install tools
       - name: Add GOBIN to $PATH