diff --git a/angularjs/angular.d.ts b/angularjs/angular.d.ts
index 0618f05805..67293aecfd 100755
--- a/angularjs/angular.d.ts
+++ b/angularjs/angular.d.ts
@@ -580,13 +580,13 @@ declare module ng {
         headers?: any;
 
         cache?: any;
-        timeout?: number;
         withCredentials?: boolean;
 
         // These accept multiple types, so let's defile them as any
         data?: any;
         transformRequest?: any;
         transformResponse?: any;
+        timeout?: any; // number | promise
     }
 
     interface IHttpPromiseCallback<T> {