diff --git a/angular-ui/angular-ui-router.d.ts b/angular-ui/angular-ui-router.d.ts
index 82bd14f38..f927ec6f7 100644
--- a/angular-ui/angular-ui-router.d.ts
+++ b/angular-ui/angular-ui-router.d.ts
@@ -91,4 +91,8 @@ declare module ng.ui {
     interface IStateParamsService {
         [key: string]: any;
     }
+
+    interface IUrlRouter {
+        sync(): void;
+    }
 }