diff --git a/lib/Doctrine.php b/lib/Doctrine.php
index 3faa5eefb..f953b8694 100644
--- a/lib/Doctrine.php
+++ b/lib/Doctrine.php
@@ -343,7 +343,7 @@ final class Doctrine {
         if(class_exists($classname))
             return false;
 
-        $class = self::$path.DIRECTORY_SEPARATOR.str_replace("_",DIRECTORY_SEPARATOR,$classname).".php";
+        $class = self::$path.DIRECTORY_SEPARATOR . str_replace('_', DIRECTORY_SEPARATOR,$classname) . '.php';
 
         if( ! file_exists($class))
             return false;