diff --git a/network/management.yaml b/network/management.yaml
index 77fcd4ea93..335bf7fd9e 100644
--- a/network/management.yaml
+++ b/network/management.yaml
@@ -39,7 +39,7 @@ parameters:
     description: Ip allocation pool range for the management network.
     type: json
   ManagementInterfaceDefaultRoute:
-    default: null
+    default: ""
     description: The default route of the management network.
     type: string