diff --git a/Klein.php b/Klein.php
index b424c22..76947a2 100644
--- a/Klein.php
+++ b/Klein.php
@@ -3,7 +3,7 @@
 class Klein {
     public $code;
 
-    function _construct($html) {
+    function __construct($html) {
         $pattern = array_map(function ($grammar) {
             list(, $result) = $grammar;
             $body = strtr($grammar[0], [' ' => "\s*", '+' => "\s+", ':var' => "(\w+(\s*\.\s*\w+)*)", ':id' => "(\w+)", '{{' => "{{\!?"]);