Index: handler/ha_innodb.cc
===================================================================
--- handler/ha_innodb.cc	(revision 1572)
+++ handler/ha_innodb.cc	(working copy)
@@ -3306,8 +3306,6 @@ no_commit:
         if (error == DB_DUPLICATE_KEY && auto_inc_used
             && (user_thd->lex->sql_command == SQLCOM_REPLACE
                 || user_thd->lex->sql_command == SQLCOM_REPLACE_SELECT
-		|| (user_thd->lex->sql_command == SQLCOM_INSERT
-		    && user_thd->lex->duplicates == DUP_UPDATE)
                 || (user_thd->lex->sql_command == SQLCOM_LOAD
                     && user_thd->lex->duplicates == DUP_REPLACE))) {
 
@@ -3538,6 +3536,27 @@ ha_innobase::update_row(
 
 	error = row_update_for_mysql((byte*) old_row, prebuilt);
 
+	/* We need to do some special AUTOINC handling for the following case:
+
+	    INSERT INTO t (c1,c2) VALUES(x,y) ON DUPLICATE KEY UPDATE ...
+
+	We need to use the AUTOINC counter that was actually used by
+	MySQL in the UPDATE statement, which can be different from the
+	value used in the INSERT statement.*/
+	if (error == DB_SUCCESS
+	    && table->next_number_field && new_row == table->record[0]
+	    && user_thd->lex->sql_command == SQLCOM_INSERT
+	    && user_thd->lex->duplicates == DUP_UPDATE) {
+
+		longlong	auto_inc;
+
+                auto_inc = table->next_number_field->val_int();
+
+                if (auto_inc != 0) {
+                        dict_table_autoinc_update(prebuilt->table, auto_inc);
+                }
+	}
+
 	innodb_srv_conc_exit_innodb(prebuilt->trx);
 
 	error = convert_error_code_to_mysql(error, user_thd);