diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index fd3f963..9d7e072 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -214,7 +214,7 @@
 	function escape_str($str)	
 	{	
 		// Escape single quotes
-		return str_replace("'", "''", $this->input->_remove_invisible_characters($str));
+		return str_replace("'", "''", $this->CI->input->_remove_invisible_characters($str));
 	}
 	
 	// --------------------------------------------------------------------