diff --git a/lib/ddl/mssql_sql_generator.php b/lib/ddl/mssql_sql_generator.php
index b88fdde677a..2067a44eb1c 100644
--- a/lib/ddl/mssql_sql_generator.php
+++ b/lib/ddl/mssql_sql_generator.php
@@ -282,7 +282,7 @@ class mssql_sql_generator extends sql_generator {
     /**
      * Given one xmldb_table and one xmldb_field, return the SQL statements needed to alter the field in the table
      */
-    public function getAlterFieldSQL($xmldb_table, $xmldb_field) {
+    public function getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause = NULL, $skip_default_clause = NULL, $skip_notnull_clause = NULL) {
 
         $results = array(); /// To store all the needed SQL commands
 
diff --git a/lib/ddl/postgres_sql_generator.php b/lib/ddl/postgres_sql_generator.php
index 31b8374c57a..cb8e00b06b4 100644
--- a/lib/ddl/postgres_sql_generator.php
+++ b/lib/ddl/postgres_sql_generator.php
@@ -208,7 +208,7 @@ class postgres_sql_generator extends sql_generator {
      *     - Changes in null/not null require the SET/DROP NOT NULL clause
      *     - Changes in default require the SET/DROP DEFAULT clause
      */
-    public function getAlterFieldSQL($xmldb_table, $xmldb_field) {
+    public function getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause = NULL, $skip_default_clause = NULL, $skip_notnull_clause = NULL) {
         $results = array(); /// To store all the needed SQL commands
 
     /// Get the normla names of the table and field
diff --git a/lib/ddl/sql_generator.php b/lib/ddl/sql_generator.php
index 1d400e8699d..059c62016c8 100644
--- a/lib/ddl/sql_generator.php
+++ b/lib/ddl/sql_generator.php
@@ -1140,7 +1140,7 @@ abstract class sql_generator {
     /**
      * Returns the code (array of statements) needed to execute extra statements on table rename
      */
-    public function getRenameTableExtraSQL($xmldb_table) {
+    public function getRenameTableExtraSQL($xmldb_table, $newname) {
         return array();
     }