diff --git a/externs.js b/externs.js
index 4f05ea53418..573171c6dcd 100644
--- a/externs.js
+++ b/externs.js
@@ -487,6 +487,7 @@ var TopLevel = {
     "SyncInstallation" : function () {},
     "SyncInstallationHandler" : function () {},
     "t" : function () {},
+    "takePictureAsync" : function () {},
     "Text" : function () {},
     "text" : function () {},
     "TextEncoder" : function () {},