diff --git a/bench/numbers.js b/bench/numbers.js
index cdc741f..469436b 100644
--- a/bench/numbers.js
+++ b/bench/numbers.js
@@ -4,31 +4,34 @@ var benchmark = require('benchmark')
 var suite = new benchmark.Suite()
 
 function sum (base, max) {
-  var total = 0
-
-  for (var i = base; i < max; i++) {
+  var total = base
+  for (var i = base + 1; i < max; i++) {
     total += i
   }
+  return total
 }
 
 
 suite.add('sum small', function smallSum () {
   var base = 0
   var max = 65535
+  // 0 + 1 + ... + 65535 = 2147450880 < 2147483647
 
   sum(base, max)
 })
 
 suite.add('from small to big', function bigSum () {
   var base = 32768
-  var max = 98304
+  var max = 98303
+  // 32768 + 32769 + ... + 98303 = 4294934528 > 2147483647
 
   sum(base, max)
 })
 
 suite.add('all big', function bigSum () {
-  var base = 65536
-  var max = 131071
+  var base = 2147483648
+  var max = 2147549183
+  // 2147483648 > 2147483647
 
   sum(base, max)
 })
diff --git a/bench/object-creation.js b/bench/object-creation.js
index 8e0412c..1e8fb32 100644
--- a/bench/object-creation.js
+++ b/bench/object-creation.js
@@ -14,17 +14,18 @@ function MyCtor (x) {
   this.x = x
 }
 
+var obj
 
 suite.add('literal', function base () {
-  var obj = { x: 1 }
+  obj = { x: 1 }
 })
 
 suite.add('class', function allNums () {
-  var obj = new MyClass(1)
+  obj = new MyClass(1)
 })
 
 suite.add('constructor', function allNums () {
-  var obj = new MyCtor(1)
+  obj = new MyCtor(1)
 })
 
 suite.on('cycle', () => runs = 0)