diff --git a/.github/workflows/gcc.yml b/.github/workflows/gcc.yml
index 2e412df5..0a6114a8 100644
--- a/.github/workflows/gcc.yml
+++ b/.github/workflows/gcc.yml
@@ -1,6 +1,10 @@
 name: gcc
 
-on: push
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   build:
diff --git a/.github/workflows/msvc.yml b/.github/workflows/msvc.yml
index 2b642716..89aca044 100644
--- a/.github/workflows/msvc.yml
+++ b/.github/workflows/msvc.yml
@@ -1,6 +1,10 @@
 name: MSVC
 
-on: push
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   build: