diff --git a/jquery.validation/jquery.validation-tests.ts b/jquery.validation/jquery.validation-tests.ts
index b8f7a16ae..e0bdc4660 100644
--- a/jquery.validation/jquery.validation-tests.ts
+++ b/jquery.validation/jquery.validation-tests.ts
@@ -142,12 +142,12 @@ function test_validate() {
     $(".selector").validate({
         highlight: function (element, errorClass, validClass) {
             $(element).addClass(errorClass).removeClass(validClass);
-            $(element.form).find("label[for=" + element.id + "]")
+            $((<HTMLInputElement>element).form).find("label[for=" + element.id + "]")
                            .addClass(errorClass);
         },
         unhighlight: function (element, errorClass, validClass) {
             $(element).removeClass(errorClass).addClass(validClass);
-            $(element.form).find("label[for=" + element.id + "]")
+            $((<HTMLInputElement>element).form).find("label[for=" + element.id + "]")
                            .removeClass(errorClass);
         }
     });