diff --git a/util/AutoloadBuilder.php b/util/AutoloadBuilder.php
index 894c6ee..651bb16 100644
--- a/util/AutoloadBuilder.php
+++ b/util/AutoloadBuilder.php
@@ -41,9 +41,9 @@ class AutoloadBuilder
             foreach ($iterator as $file) {
                 // skip non php files
                 $e = explode('.', $file->getFileName());
-                if ((end($e) !== 'php') || strstr((string)$file, 'test')) {
-                    continue;
-                }
+                if ((end($e) !== 'php') || strstr($file->getFileName(), 'test')) {
+                   continue;
+               }
                 
                 $content = file_get_contents($file->getRealPath());
                 $matches = array();