diff --git a/weed/iamapi/iamapi_server.go b/weed/iamapi/iamapi_server.go
index 9fea30780..ad1a8c4a2 100644
--- a/weed/iamapi/iamapi_server.go
+++ b/weed/iamapi/iamapi_server.go
@@ -49,7 +49,7 @@ var s3ApiConfigure IamS3ApiConfig
 func NewIamApiServer(router *mux.Router, option *IamServerOption) (iamApiServer *IamApiServer, err error) {
 	s3ApiConfigure = IamS3ApiConfigure{
 		option:       option,
-		masterClient: wdclient.NewMasterClient(option.GrpcDialOption, pb.AdminShellClient, "", "", option.Masters),
+		masterClient: wdclient.NewMasterClient(option.GrpcDialOption, "iam", "", "", option.Masters),
 	}
 	s3Option := s3api.S3ApiServerOption{Filer: option.Filer}
 	iamApiServer = &IamApiServer{