diff --git a/d3/d3.d.ts b/d3/d3.d.ts
index 3c47883a8..4d4ef1443 100644
--- a/d3/d3.d.ts
+++ b/d3/d3.d.ts
@@ -14,13 +14,13 @@ declare module D3 {
             *
             * @param selector Selection String to match
             */
-            (selector: string): Selection;
+            (selector?: string): Selection;
             /**
             * Selects the specified node
             *
             * @param element Node element to select
             */
-            (element: EventTarget): Selection;
+            (element?: EventTarget): Selection;
         };
 
         /**