diff --git a/xCAT-server/share/xcat/install/scripts/pre.rhels8 b/xCAT-server/share/xcat/install/scripts/pre.rhels8
index 2fb50c424..c98667d42 100644
--- a/xCAT-server/share/xcat/install/scripts/pre.rhels8
+++ b/xCAT-server/share/xcat/install/scripts/pre.rhels8
@@ -214,7 +214,7 @@ getdisksize()
 
 	disk="${disk#/dev/}"
 
-	[ -z "${disk}" ] && return
+	[ -z "${disk}" ] && echo "0" && return
 
 	local blah
 	local blocks