diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7511ffd..0498567 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,8 @@
 name: 'Test the action'
-on: [ pull_request ]
+on:
+  pull_request:
+    branches:
+      - master
 
 jobs:
   test-json: