diff --git a/tools/wrap.start b/tools/wrap.start
index d9572cb..29c64f9 100644
--- a/tools/wrap.start
+++ b/tools/wrap.start
@@ -8,6 +8,6 @@
         // Browser globals
         root.principium = factory(root.$, root._);
     }
-}(this, function ($, _) {
+}(window, function ($, _) {