diff --git a/engine/Engine.php b/engine/Engine.php
index 381cb0c..e02c746 100644
--- a/engine/Engine.php
+++ b/engine/Engine.php
@@ -142,10 +142,10 @@ class Engine
 
     /**
      * 检测是否含有include
-     * @param $template
+     * @param &$template
      * @return bool
      */
-    private function hasInclude($template)
+    private function hasInclude(&$template)
     {
         $pattern = '/' . $this->left . 'include\s+file[\s\S]*?=[\s\S]*?[\'"](.*?)[\'"][\s\S]*?\/' . $this->right . '/is';
         preg_match($pattern, $template, $matches);