diff --git a/utils/build/externs/common.js b/utils/build/externs/common.js
index 68c99baf5c49e13e873413156eab8b9b749ab124..7c4ce120331611f1e29abab980e43105d53d91bd 100644
--- a/utils/build/externs/common.js
+++ b/utils/build/externs/common.js
@@ -5,3 +5,4 @@ var global;
 var module;
 var exports;
 var JSON;
+var performance;