diff --git a/util/walk.js b/util/walk.js
index 5a09df7ddc..9dcddaa3e9 100644
--- a/util/walk.js
+++ b/util/walk.js
@@ -172,7 +172,7 @@
   };
   base.Statement = skipThrough;
   base.EmptyStatement = ignore;
-  base.ExpressionStatement = function(node, st, c) {
+  base.ExpressionStatement = base.ParenthesizedExpression = function(node, st, c) {
     c(node.expression, st, "Expression");
   };
   base.IfStatement = function(node, st, c) {