diff --git a/system/database/drivers/cubrid/cubrid_forge.php b/system/database/drivers/cubrid/cubrid_forge.php
index c3251bd..6bfc7c2 100644
--- a/system/database/drivers/cubrid/cubrid_forge.php
+++ b/system/database/drivers/cubrid/cubrid_forge.php
@@ -42,7 +42,7 @@
 	 * @param	string	the database name
 	 * @return	bool
 	 */
-	public function _create_database($name)
+	protected function _create_database($name)
 	{
 		// CUBRID does not allow to create a database in SQL. The GUI tools
 		// have to be used for this purpose.
@@ -57,7 +57,7 @@
 	 * @param	string	the database name
 	 * @return	bool
 	 */
-	public function _drop_database($name)
+	protected function _drop_database($name)
 	{
 		// CUBRID does not allow to drop a database in SQL. The GUI tools
 		// have to be used for this purpose.
@@ -72,7 +72,7 @@
 	 * @param	mixed	the fields
 	 * @return	string
 	 */
-	public function _process_fields($fields)
+	protected function _process_fields($fields)
 	{
 		$current_field_count = 0;
 		$sql = '';
@@ -176,7 +176,7 @@
 	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
 	 * @return	bool
 	 */
-	public function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
+	protected function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
 	{
 		$sql = 'CREATE TABLE ';
 
@@ -230,7 +230,7 @@
 	 *
 	 * @return	string
 	 */
-	public function _drop_table($table)
+	protected function _drop_table($table)
 	{
 		return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);
 	}
@@ -249,7 +249,7 @@
 	 * @param	string	the field after which we should add the new field
 	 * @return	object
 	 */
-	public function _alter_table($alter_type, $table, $fields, $after_field = '')
+	protected function _alter_table($alter_type, $table, $fields, $after_field = '')
 	{
 		$sql = 'ALTER TABLE '.$this->db->protect_identifiers($table).' '.$alter_type.' ';
 
@@ -280,7 +280,7 @@
 	 * @param	string	the new table name
 	 * @return	string
 	 */
-	public function _rename_table($table_name, $new_table_name)
+	protected function _rename_table($table_name, $new_table_name)
 	{
 		return 'RENAME TABLE '.$this->db->protect_identifiers($table_name).' AS '.$this->db->protect_identifiers($new_table_name);
 	}
diff --git a/system/database/drivers/cubrid/cubrid_utility.php b/system/database/drivers/cubrid/cubrid_utility.php
index bc54e7a..de28e63 100644
--- a/system/database/drivers/cubrid/cubrid_utility.php
+++ b/system/database/drivers/cubrid/cubrid_utility.php
@@ -42,7 +42,7 @@
 	 * @access	private
 	 * @return	array
 	 */
-	public function _list_databases()
+	protected function _list_databases()
 	{
 		// CUBRID does not allow to see the list of all databases on the
 		// server. It is the way its architecture is designed. Every
@@ -71,7 +71,7 @@
 	 * @return	object
 	 * @link 	http://www.cubrid.org/manual/840/en/Optimize%20Database
 	 */
-	public function _optimize_table($table)
+	protected function _optimize_table($table)
 	{
 		// No SQL based support in CUBRID as of version 8.4.0. Database or
 		// table optimization can be performed using CUBRID Manager
@@ -91,7 +91,7 @@
 	 * @return	object
 	 * @link 	http://www.cubrid.org/manual/840/en/Checking%20Database%20Consistency
 	 */
-	public function _repair_table($table)
+	protected function _repair_table($table)
 	{
 		// Not supported in CUBRID as of version 8.4.0. Database or
 		// table consistency can be checked using CUBRID Manager
@@ -107,7 +107,7 @@
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// No SQL based support in CUBRID as of version 8.4.0. Database or
 		// table backup can be performed using CUBRID Manager