diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f27a2cf1..5974ea8a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -2,9 +2,11 @@ name: ci
 
 on:
   push:
+  pull_request:
 
 jobs:
   build:
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.fork
     runs-on: ubuntu-latest
     permissions:
       contents: write