diff --git a/source/adapter.js b/source/adapter.js
index 4c72735..26f00c5 100644
--- a/source/adapter.js
+++ b/source/adapter.js
@@ -1,5 +1,5 @@
 // Adapter's interface.
-var AdapterJS = AdapterJS || {};
+var AdapterJS = (window && window.AdapterJS) || {};
 
 // Browserify compatibility
 if(typeof exports !== 'undefined') {