diff --git a/src/observable/dom/AjaxObservable.ts b/src/observable/dom/AjaxObservable.ts
index 9ae9916899..8a94a70a1b 100644
--- a/src/observable/dom/AjaxObservable.ts
+++ b/src/observable/dom/AjaxObservable.ts
@@ -11,7 +11,7 @@ export interface AjaxRequest {
   body?: any;
   user?: string;
   async?: boolean;
-  method: string;
+  method?: string;
   headers?: Object;
   timeout?: number;
   password?: string;