diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index befb3a98..94e7ab18 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -1,6 +1,12 @@
 name: Tests
 
-on: [push]
+on:
+  # if pushed directly to the master
+  push:
+    branches:
+      - master
+  # on a pull request
+  pull_request:
 
 jobs:
   unit-test: