diff --git a/Src/Sunra/PhpSimple/simplehtmldom_1_5/simple_html_dom.php b/Src/Sunra/PhpSimple/simplehtmldom_1_5/simple_html_dom.php
index 2024b66..427183a 100644
--- a/Src/Sunra/PhpSimple/simplehtmldom_1_5/simple_html_dom.php
+++ b/Src/Sunra/PhpSimple/simplehtmldom_1_5/simple_html_dom.php
@@ -62,7 +62,10 @@
 define('DEFAULT_TARGET_CHARSET', 'UTF-8');
 define('DEFAULT_BR_TEXT', "\r\n");
 define('DEFAULT_SPAN_TEXT', " ");
-define('MAX_FILE_SIZE', 600000);
+if (!defined('MAX_FILE_SIZE'))
+{
+    define('MAX_FILE_SIZE', 600000);
+}
 // helper functions
 // -----------------------------------------------------------------------------
 // get html dom from file