diff --git a/Doctrine/adodb-hack/drivers/datadict-mysql.inc.php b/Doctrine/adodb-hack/drivers/datadict-mysql.inc.php
index 4b199fb08..2153c46e5 100644
--- a/Doctrine/adodb-hack/drivers/datadict-mysql.inc.php
+++ b/Doctrine/adodb-hack/drivers/datadict-mysql.inc.php
@@ -108,7 +108,7 @@ class ADODB2_mysql extends ADODB_DataDict {
 	}
 	
 	// return string must begin with space
-	function _CreateSuffix($fname,$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned)
+	function _CreateSuffix($fname,$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned = null)
 	{	
 		$suffix = '';
 		if ($funsigned) $suffix .= ' UNSIGNED';