diff --git a/d3/d3.d.ts b/d3/d3.d.ts
index a9684658b4..e97e12bf53 100644
--- a/d3/d3.d.ts
+++ b/d3/d3.d.ts
@@ -719,6 +719,7 @@ declare module D3 {
         datum: {
             (values: (data: any, index: number) => any): UpdateSelection;
             (values: any): UpdateSelection;
+            () : any;
         };
 
         filter: {