diff --git a/.github/workflows/msvc-ci.yml b/.github/workflows/msvc-ci.yml
index 4fae289a0..2dd722eda 100644
--- a/.github/workflows/msvc-ci.yml
+++ b/.github/workflows/msvc-ci.yml
@@ -2,7 +2,9 @@ name: msvc
 
 on:
   push:
+    branches: [ master ]
   pull_request:
+    branches: [ master ]
 
 jobs:
   msvc:
diff --git a/.github/workflows/msys2-ci.yml b/.github/workflows/msys2-ci.yml
index 26219b046..a0405e3f8 100644
--- a/.github/workflows/msys2-ci.yml
+++ b/.github/workflows/msys2-ci.yml
@@ -2,7 +2,9 @@ name: msys2
 
 on:
   push:
+    branches: [ master ]
   pull_request:
+    branches: [ master ]
 
 jobs:
   msys2: