diff --git a/lib/attribute.js b/lib/attribute.js
index a4eb0ce2..0596ebc7 100644
--- a/lib/attribute.js
+++ b/lib/attribute.js
@@ -296,7 +296,7 @@ module.exports = function wrapAttributeState (
           vao.primitive = primitives[options.primitive]
         }
 
-        check.optional(() => {
+        check.optional(function () {
           var keys = Object.keys(options)
           for (var i = 0; i < keys.length; ++i) {
             check(VAO_OPTIONS.indexOf(keys[i]) >= 0, 'invalid option for vao: "' + keys[i] + '" valid options are ' + VAO_OPTIONS)