diff --git a/.github/workflows/s390x.yml b/.github/workflows/s390x.yml
index 1b254a3..d498582 100644
--- a/.github/workflows/s390x.yml
+++ b/.github/workflows/s390x.yml
@@ -3,10 +3,10 @@ name: Ubuntu s390x (GCC 11)
 on:
   push:
     branches:
-      - main
+      - master
   pull_request:
     branches:
-      - main
+      - master
 
 jobs:
   build: