diff --git a/web/app/store/index.ts b/web/app/store/index.ts
index f0c0dabe..3d8db78e 100644
--- a/web/app/store/index.ts
+++ b/web/app/store/index.ts
@@ -35,7 +35,7 @@ export interface StoreState {
   };
 }
 
-const reducers = combineReducers(storeReducers);
+const reducers = combineReducers<StoreState>(storeReducers);
 const middleware = applyMiddleware(thunk);
 
 /**