diff --git a/lib/sys.js b/lib/sys.js
index 6fee91e2f4e..1ea68a70cd9 100644
--- a/lib/sys.js
+++ b/lib/sys.js
@@ -121,7 +121,7 @@ exports.inspect = function (obj, showHidden, depth) {
       }
     }
 
-    output = keys.map(function (key) {
+    var output = keys.map(function (key) {
       var name, str;
       if (value.__lookupGetter__) {
         if (value.__lookupGetter__(key)) {