diff --git a/phpBB/install/database_update.php b/phpBB/install/database_update.php
index fa691d9119..dae441f40b 100644
--- a/phpBB/install/database_update.php
+++ b/phpBB/install/database_update.php
@@ -196,33 +196,6 @@ $dbms_type_map = array(
 		'VARBINARY'	=> '[varchar] (255)',
 	),
 
-	'db2'		=> array(
-		'INT:'		=> 'integer',
-		'BINT'		=> 'float',
-		'UINT'		=> 'integer',
-		'UINT:'		=> 'integer',
-		'TINT:'		=> 'smallint',
-		'USINT'		=> 'smallint',
-		'BOOL'		=> 'smallint',
-		'VCHAR'		=> 'varchar(255)',
-		'VCHAR:'	=> 'varchar(%d)',
-		'CHAR:'		=> 'char(%d)',
-		'XSTEXT'	=> 'varchar(1000)',
-		'STEXT'		=> 'varchar(3000)',
-		'TEXT'		=> 'varchar(8000)',
-		'MTEXT'		=> 'varchar(32672)',
-		'XSTEXT_UNI'=> 'varchar(100)',
-		'STEXT_UNI'	=> 'varchar(255)',
-		'TEXT_UNI'	=> 'varchar(4000)',
-		'MTEXT_UNI'	=> 'varchar(32672)',
-		'TIMESTAMP'	=> 'integer',
-		'DECIMAL'	=> 'float',
-		'VCHAR_UNI'	=> 'varchar(255)',
-		'VCHAR_UNI:'=> 'varchar(%d)',
-		'VCHAR_CI'	=> 'varchar(255)',
-		'VARBINARY'	=> 'varchar(255)',
-	),
-
 	'oracle'	=> array(
 		'INT:'		=> 'number(%d)',
 		'BINT'		=> 'number(20)',