diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 6e91c31eb..d330e9ec6 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -29,8 +29,8 @@ type MasterClient struct {
 	vidMap
 	vidMapCacheSize int
 
-	OnPeerUpdate           func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)
-	OnPeerUpdateAccessLock sync.RWMutex
+	OnPeerUpdate     func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)
+	OnPeerUpdateLock sync.RWMutex
 }
 
 func NewMasterClient(grpcDialOption grpc.DialOption, filerGroup string, clientType string, clientHost pb.ServerAddress, clientDataCenter string, rack string, masters map[string]pb.ServerAddress) *MasterClient {
@@ -47,9 +47,9 @@ func NewMasterClient(grpcDialOption grpc.DialOption, filerGroup string, clientTy
 }
 
 func (mc *MasterClient) SetOnPeerUpdateFn(onPeerUpdate func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)) {
-	mc.OnPeerUpdateAccessLock.Lock()
+	mc.OnPeerUpdateLock.Lock()
 	mc.OnPeerUpdate = onPeerUpdate
-	mc.OnPeerUpdateAccessLock.Unlock()
+	mc.OnPeerUpdateLock.Unlock()
 }
 
 func (mc *MasterClient) GetLookupFileIdFunction() LookupFileIdFunctionType {
@@ -227,7 +227,7 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 
 			if resp.ClusterNodeUpdate != nil {
 				update := resp.ClusterNodeUpdate
-				mc.OnPeerUpdateAccessLock.RLock()
+				mc.OnPeerUpdateLock.RLock()
 				if mc.OnPeerUpdate != nil {
 					if update.FilerGroup == mc.FilerGroup {
 						if update.IsAdd {
@@ -239,7 +239,7 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 						mc.OnPeerUpdate(update, time.Now())
 					}
 				}
-				mc.OnPeerUpdateAccessLock.RUnlock()
+				mc.OnPeerUpdateLock.RUnlock()
 			}
 		}
 	})