diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 26fc450c..981abe0b 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -2,6 +2,7 @@ name: pages
 
 on:
   push:
+    branches: [master]
     paths:
       - "site/**"
       - "stdlib/**"