diff --git a/redux-immutable/index.d.ts b/redux-immutable/index.d.ts
index 2c378f02d8..483de7c9bf 100644
--- a/redux-immutable/index.d.ts
+++ b/redux-immutable/index.d.ts
@@ -1,8 +1,8 @@
-// Type definitions for redux-immutable v3.0.5
+// Type definitions for redux-immutable v3.0.10
 // Project: https://github.com/gajus/redux-immutable
-// Definitions by: Pedro Pereira <https://github.com/oizie>
+// Definitions by: Pedro Pereira <https://github.com/oizie>, Sebastian Sebald <https://github.com/sebald/>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 import * as Redux from 'redux';
 
-export declare function combineReducers(reducers: Object): Redux.Reducer<any>;
+export declare function combineReducers<S>(reducers: Redux.ReducersMapObject): Redux.Reducer<S>;