diff --git a/jquery/jquery.d.ts b/jquery/jquery.d.ts
index b67605685..d7688f187 100644
--- a/jquery/jquery.d.ts
+++ b/jquery/jquery.d.ts
@@ -241,7 +241,7 @@ interface JQueryCallback {
      * @param context A reference to the context in which the callbacks in the list should be fired.
      * @param arguments An argument, or array of arguments, to pass to the callbacks in the list.
      */
-    fireWith(context?: any, args: any[]): JQueryCallback;
+    fireWith(context?: any, args?: any[]): JQueryCallback;
 
     /**
      * Determine whether a supplied callback is in a list