diff --git a/src/expose.js b/src/expose.js
index cdf3366b4..7c7bf686a 100644
--- a/src/expose.js
+++ b/src/expose.js
@@ -50,7 +50,7 @@ extend(Hammer, {
     prefixed: prefixed
 });
 
-if (typeof define == TYPE_FUNCTION && define.amd) {
+if (typeof define === 'function' && define.amd) {
     define(function() {
         return Hammer;
     });