diff --git a/d3/d3.d.ts b/d3/d3.d.ts
index 41fc04dff..b2f0bf1c9 100644
--- a/d3/d3.d.ts
+++ b/d3/d3.d.ts
@@ -751,8 +751,8 @@ declare module D3 {
         empty: () => boolean;
             
         data: {
-            (values: (data: any, index?: number) => any[], key?: (data: any, index?: number) => string): UpdateSelection;
-            (values: any[], key?: (data: any, index?: number) => string): UpdateSelection;
+            (values: (data: any, index?: number) => any[], key?: (data: any, index?: number) => any): UpdateSelection;
+            (values: any[], key?: (data: any, index?: number) => any): UpdateSelection;
             (): any[];
         };