diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4259b746..920dd4a2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,9 @@ on:
   push:
     branches:
       - main
-  pull_request_target: null
+  pull_request_target:
+    branches:
+      - main
 
 jobs:
   lint-tidy: