diff --git a/lib/Doctrine/Export.php b/lib/Doctrine/Export.php
index 997a5d8d4..08ea6abbb 100644
--- a/lib/Doctrine/Export.php
+++ b/lib/Doctrine/Export.php
@@ -152,7 +152,7 @@ class Doctrine_Export extends Doctrine_Connection_Module {
      * @param string    $start          start value of the sequence; default is 1
      * @return void
      */
-    public function createSequence($seqName, $start = 1) {
+    public function createSequence($seqName, $seqcolName, $start = 1) {
         throw new Doctrine_Export_Exception('Create sequence not supported by this driver.');
     }
 
diff --git a/lib/Doctrine/Export/Mysql.php b/lib/Doctrine/Export/Mysql.php
index a5259ea90..90bf6fd76 100644
--- a/lib/Doctrine/Export/Mysql.php
+++ b/lib/Doctrine/Export/Mysql.php
@@ -222,7 +222,7 @@ class Doctrine_Export_Mysql extends Doctrine_Export {
      *                           actually perform them otherwise.
      * @return boolean
      */
-    public function alterTable($name, $changes, $check) {
+    public function alterTable($name, array $changes, $check) {
         if( ! $name)
             throw new Doctrine_Export_Mysql_Exception('no valid table name specified');