diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml
index ca149d988f..f46fa6c4e5 100644
--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -1,6 +1,15 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  # Trigger the workflow on push or pull requests, but only for the
+  # master branch
+  push:
+    branches:
+      - master
+      - '*/ci'
+  pull_request:
+    branches:
+      - master
 
 jobs:
   fuzzing:
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 36eb46d635..6c76ca78a8 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -1,6 +1,15 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  # Trigger the workflow on push or pull requests, but only for the
+  # master branch
+  push:
+    branches:
+      - master
+      - '*/ci'
+  pull_request:
+    branches:
+      - master
 
 jobs:
   autotools: