diff --git a/system/codeigniter/CodeIgniter.php b/system/codeigniter/CodeIgniter.php
index 866be35..04936b9 100644
--- a/system/codeigniter/CodeIgniter.php
+++ b/system/codeigniter/CodeIgniter.php
@@ -43,7 +43,14 @@
  * ------------------------------------------------------
  */
 require(BASEPATH.'codeigniter/Compat'.EXT);
-	
+
+/*
+ * ------------------------------------------------------
+ *  Load the compatibility override functions
+ * ------------------------------------------------------
+ */
+require(APPPATH.'config/constants'.EXT);
+
 /*
  * ------------------------------------------------------
  *  Define a custom error handler so we can log PHP errors