diff --git a/chrome/chrome.d.ts b/chrome/chrome.d.ts
index e77f744faa..cbabf893ae 100755
--- a/chrome/chrome.d.ts
+++ b/chrome/chrome.d.ts
@@ -5,6 +5,13 @@
 
 /// <reference path='../webrtc/MediaStream.d.ts'/>
 
+////////////////////
+// Global object
+////////////////////
+interface Window {
+    chrome: typeof chrome;
+}
+
 ////////////////////
 // Alarms
 ////////////////////