diff --git a/packages/babel/src/traversal/context.js b/packages/babel/src/traversal/context.js
index d03335f138..097a47bb3e 100644
--- a/packages/babel/src/traversal/context.js
+++ b/packages/babel/src/traversal/context.js
@@ -10,9 +10,10 @@ export default class TraversalContext {
     this.scope      = scope;
     this.state      = state;
     this.opts       = opts;
-    this.queue      = null;
   }
 
+  queue = null;
+
   /**
    * [Please add a description.]
    */