diff --git a/.github/workflows/c-workflow-for-main-makefile.yml b/.github/workflows/c-workflow-for-main-makefile.yml
index df47e94..6f88a7e 100644
--- a/.github/workflows/c-workflow-for-main-makefile.yml
+++ b/.github/workflows/c-workflow-for-main-makefile.yml
@@ -2,7 +2,7 @@ name: C CI for Main Makefile
 
 on:
   pull_request:
-    branches: [ "master" ]
+    branches: [ "Master" ]
 
 jobs:
   build-and-test: