diff --git a/src/showdown.js b/src/showdown.js
index b488bad..9ce7bcb 100644
--- a/src/showdown.js
+++ b/src/showdown.js
@@ -64,7 +64,9 @@
 //
 // Showdown namespace
 //
-var Showdown = { extensions: {} };
+var Showdown = typeof exports === 'object' ? exports : {};
+
+Showdown.extensions = {};
 
 //
 // forEach
@@ -1441,9 +1443,6 @@ var escapeCharacters_callback = function(wholeMatch,m1) {
 } // end of Showdown.converter
 
 
-// export
-if (typeof module !== 'undefined') module.exports = Showdown;
-
 // stolen from AMD branch of underscore
 // AMD define happens at the end for compatibility with AMD loaders
 // that don't enforce next-turn semantics on modules.