diff --git a/src/Stringy.php b/src/Stringy.php
index 4cb6100..c71416d 100644
--- a/src/Stringy.php
+++ b/src/Stringy.php
@@ -186,7 +186,7 @@ class Stringy implements \Countable, \IteratorAggregate, \ArrayAccess
     public function chars()
     {
         $chars = array();
-        for ($i = 0; $i < $this->length(); $i++) {
+        for ($i = 0, $l = $this->length(); $i < $l; $i++) {
             $chars[] = $this->at($i)->str;
         }