diff --git a/phase1/master.cfg b/phase1/master.cfg
index 41968d6..cefeaf0 100644
--- a/phase1/master.cfg
+++ b/phase1/master.cfg
@@ -563,7 +563,8 @@ c["schedulers"].append(
 
 
 def IsNoMasterBuild(step):
-    return step.getProperty("branch") != "main"
+    branch = step.getProperty("branch")
+    return branch not in ["main", "master"]
 
 
 def IsUsignEnabled(step):