diff --git a/redux-immutable/redux-immutable.d.ts b/redux-immutable/redux-immutable.d.ts
index 21c9096846..df0f3745af 100644
--- a/redux-immutable/redux-immutable.d.ts
+++ b/redux-immutable/redux-immutable.d.ts
@@ -3,6 +3,8 @@
 // Definitions by: Pedro Pereira <https://github.com/oizie>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+/// <reference path="../redux/redux.d.ts" />
+
 declare module "redux-immutable" {
-    export function combineReducers(reducers : Object): Object;
-}
\ No newline at end of file
+    export function combineReducers(reducers : Object): Redux.Reducer;
+}