diff --git a/.github/workflows/draft-pdf.yml b/.github/workflows/draft-pdf.yml
index 0dec7ffe3..4550f6314 100644
--- a/.github/workflows/draft-pdf.yml
+++ b/.github/workflows/draft-pdf.yml
@@ -1,4 +1,10 @@
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   paper: