diff --git a/lib/util/codegen.js b/lib/util/codegen.js
index 0b1d3b4c..34c300df 100644
--- a/lib/util/codegen.js
+++ b/lib/util/codegen.js
@@ -18,11 +18,8 @@ module.exports = function createEnvironment () {
   var linkedNames = []
   var linkedValues = []
   function link (value) {
-    for (var i = 0; i < linkedValues.length; ++i) {
-      if (linkedValues[i] === value) {
-        return linkedNames[i]
-      }
-    }
+    var i = linkedValues.indexOf(value)
+    if (i >= 0) return linkedNames[i]
 
     var name = 'g' + (varCounter++)
     linkedNames.push(name)