diff --git a/src/observable/dom/ajax.ts b/src/observable/dom/ajax.ts
index d93ea4b159..70b1a59e54 100644
--- a/src/observable/dom/ajax.ts
+++ b/src/observable/dom/ajax.ts
@@ -198,6 +198,8 @@ export class AjaxSubscriber<T> extends Subscriber<Event> {
     if (result === errorObject) {
       return this.error(errorObject.e);
     }
+
+    xhr.send();
   }
 
   private createXHR(): XMLHttpRequest {