diff --git a/mithril.js b/mithril.js
index 93202c79..28a2596d 100644
--- a/mithril.js
+++ b/mithril.js
@@ -1,5 +1,5 @@
 ;(function() {
-
+"use strict"
 function Vnode(tag, key, attrs0, children, text, dom) {
 	return {tag: tag, key: key, attrs: attrs0, children: children, text: text, dom: dom, domSize: undefined, state: undefined, events: undefined, instance: undefined, skip: false}
 }