diff --git a/routie/routie.d.ts b/routie/routie.d.ts
index cd3bb09dc1..8f32c3d78a 100644
--- a/routie/routie.d.ts
+++ b/routie/routie.d.ts
@@ -24,7 +24,7 @@ declare module routie {
         lookup(name: string, fn: Function): string;
         remove(path: string, fn: Function): void;
         removeAll(): void;
-        navigate(path: string, options: RouteOptions): void;
+        navigate(path: string, options?: RouteOptions): void;
         noConflict(): Routie;
     }