diff --git a/toolkit/devtools/server/actors/root.js b/toolkit/devtools/server/actors/root.js
index ec3d6ce2d97..1b7a21908fb 100644
--- a/toolkit/devtools/server/actors/root.js
+++ b/toolkit/devtools/server/actors/root.js
@@ -6,7 +6,7 @@
 
 "use strict";
 
-const { Ci } = require("chrome");
+const { Ci, Cu } = require("chrome");
 const Services = require("Services");
 const { ActorPool, appendExtraActors, createExtraActors } = require("devtools/server/actors/common");
 const { DebuggerServer } = require("devtools/server/main");