diff --git a/system/database/drivers/mysql/mysql_forge.php b/system/database/drivers/mysql/mysql_forge.php
index 282e2d1..1088c03 100644
--- a/system/database/drivers/mysql/mysql_forge.php
+++ b/system/database/drivers/mysql/mysql_forge.php
@@ -88,7 +88,7 @@
 	 *
 	 * @var	string
 	 */
-	protected $_null		= 'NULL';
+	protected $_null = 'NULL';
 
 	// --------------------------------------------------------------------
 
@@ -185,7 +185,6 @@
 			$extra_clause = ' FIRST';
 		}
 
-		$comment_clause = isset($field['comment']) ? ' COMMENT ' . $field['comment'] : '';
 
 		return $this->db->escape_identifiers($field['name'])
 			.(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))
@@ -195,7 +194,7 @@
 			.$field['default']
 			.$field['auto_increment']
 			.$field['unique']
-			.$comment_clause
+			.(empty($field['comment']) ? '' : ' COMMENT '.$field['comment'])
 			.$extra_clause;
 	}