diff --git a/underscore.string/underscore.string-tests.disabled.ts b/underscore.string/underscore.string-tests.disabled.ts
index 34c76e13e..58ff509c0 100644
--- a/underscore.string/underscore.string-tests.disabled.ts
+++ b/underscore.string/underscore.string-tests.disabled.ts
@@ -1,6 +1,8 @@
 /// <reference path='../underscore/underscore.d.ts' />
 /// <reference path='underscore.string.d.ts' />
 
+_.mixin(_['string'].exports());
+
 _.numberFormat(1000, 2);
 _.numberFormat(123456789.123, 5, '.', ',');