diff --git a/.github/workflows/build-ubuntu.yml b/.github/workflows/build-ubuntu.yml
index fed0f3e2..b57c5b75 100644
--- a/.github/workflows/build-ubuntu.yml
+++ b/.github/workflows/build-ubuntu.yml
@@ -1,6 +1,12 @@
 name: CMake Build (Ubuntu x86-64)
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 env:
   BUILD_TYPE: Release
diff --git a/.github/workflows/build-windows.yml b/.github/workflows/build-windows.yml
index c7d05d03..ec14e30a 100644
--- a/.github/workflows/build-windows.yml
+++ b/.github/workflows/build-windows.yml
@@ -1,6 +1,12 @@
 name: CMake Build (Windows x86-64)
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 env:
   BUILD_TYPE: Release