diff --git a/angular-ui-router/angular-ui-router.d.ts b/angular-ui-router/angular-ui-router.d.ts
index c82fb51d6f..256342ea52 100644
--- a/angular-ui-router/angular-ui-router.d.ts
+++ b/angular-ui-router/angular-ui-router.d.ts
@@ -16,7 +16,7 @@ declare module angular.ui {
         /**
          * String URL path to template file OR Function, returns URL path string
          */
-        templateUrl?: string | {(IStateParamsService?): string};
+        templateUrl?: string | {(IStateParamsService): string};
         /**
          * Function, returns HTML content string
          */