diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index 3eaf5c96..ccc8c499 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -1,9 +1,9 @@
 name: Cygwin
 on:
   push:
-    branches: [ $default-branch ]
+    branches: [ master ]
   pull_request:
-    branches: [ $default-branch ]
+    branches: [ master ]
 
 env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)