diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index b4ef9b2..b7563ee 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -1,7 +1,6 @@
 "use strict";
 
-let arrays  = require("../../utils/arrays"),
-    objects = require("../../utils/objects"),
+let objects = require("../../utils/objects"),
     asts    = require("../asts"),
     op      = require("../opcodes"),
     js      = require("../js");
@@ -408,7 +407,9 @@ function generateJS(ast, options) {
   }
 
   function generateRuleFunction(rule) {
-    let parts = [], code;
+    let parts     = [],
+        stackVars = [],
+        code;
 
     function c(i) { return "peg$c" + i; } // |consts[i]| of the abstract machine
     function s(i) { return "s"     + i; } // |stack[i]| of the abstract machine
@@ -429,7 +430,12 @@ function generateJS(ast, options) {
             if (n === undefined) {
               return s(this.sp--);
             } else {
-              let values = arrays.range(this.sp - n + 1, this.sp + 1).map(s);
+              let values = Array(n);
+
+              for (var i = 0; i < n; i++) {
+                values[i] = s(this.sp - n + 1 + i);
+              }
+
               this.sp -= n;
 
               return values;
@@ -714,14 +720,18 @@ function generateJS(ast, options) {
 
     parts.push('function peg$parse' + rule.name + '() {');
 
+    for (let i = 0; i <= stack.maxSp; i++) {
+      stackVars[i] = s(i);
+    }
+
     if (options.trace) {
       parts.push([
-        '  var ' + arrays.range(0, stack.maxSp + 1).map(s).join(', ') + ',',
+        '  var ' + stackVars.join(', ') + ',',
         '      startPos = peg$currPos;'
       ].join('\n'));
     } else {
       parts.push(
-        '  var ' + arrays.range(0, stack.maxSp + 1).map(s).join(', ') + ';'
+        '  var ' + stackVars.join(', ') + ';'
       );
     }