diff --git a/xCAT-server/share/xcat/install/rh/service.rhels6.x86_64.tmpl b/xCAT-server/share/xcat/install/rh/service.rhels6.x86_64.tmpl
index 2ab8ce520..98b08daae 100644
--- a/xCAT-server/share/xcat/install/rh/service.rhels6.x86_64.tmpl
+++ b/xCAT-server/share/xcat/install/rh/service.rhels6.x86_64.tmpl
@@ -16,7 +16,7 @@ keyboard "us"
 #
 # Clear the MBR
 #
-zerombr yes
+zerombr
 
 #
 # Wipe out the disk