diff --git a/jquery/jquery-tests.ts b/jquery/jquery-tests.ts
index 0a935ce445..2842c1ea3b 100644
--- a/jquery/jquery-tests.ts
+++ b/jquery/jquery-tests.ts
@@ -2372,7 +2372,7 @@ function test_EventIsCallable() {
     var ev = jQuery.Event('click');
 }
 
-$.when($.ajax("/my/page.json")).then((a,b,c) => a.asdf); // is type JQueryPromise<any>
+$.when<any>($.ajax("/my/page.json")).then(a => a.asdf); // is type JQueryPromise<any>
 $.when("asdf", "jkl;").done((x,y) => x.length + y.length, (x,y) => x.length + y.length);
 
 var f1 = $.when("fetch"); // Is type JQueryPromise<string>