diff --git a/weed-fs/src/pkg/topology/data_center.go b/weed-fs/src/pkg/topology/data_center.go
index 92e8b0055..5161234ec 100644
--- a/weed-fs/src/pkg/topology/data_center.go
+++ b/weed-fs/src/pkg/topology/data_center.go
@@ -2,7 +2,7 @@ package topology
 
 import ()
 
-type DataCenterId uint32
+type DataCenterId string
 type DataCenter struct {
 	Id      DataCenterId
 	racks   map[RackId]*Rack