diff --git a/uris.js b/uris.js
index 9cafc5f..7712aba 100644
--- a/uris.js
+++ b/uris.js
@@ -362,4 +362,5 @@
   valueOf: function() { return this.value; }
 };
 
-module.exports = URI;
\ No newline at end of file
+if (typeof(module) != "undefined")
+  module.exports = URI;