diff --git a/phpBB/install/schemas/mssql_schema.sql b/phpBB/install/schemas/mssql_schema.sql
index 7a404539e6..d04383fc37 100644
--- a/phpBB/install/schemas/mssql_schema.sql
+++ b/phpBB/install/schemas/mssql_schema.sql
@@ -459,7 +459,7 @@ CREATE TABLE [phpbb_groups] (
 	[group_type] [int] DEFAULT (1) NOT NULL ,
 	[group_name] [varchar] (255) DEFAULT ('') NOT NULL ,
 	[group_desc] [varchar] (8000) DEFAULT ('') NOT NULL ,
-	[group_desc_bitfield] [varbinary] DEFAULT (0x) NOT NULL ,
+	[group_desc_bitfield] [varbinary] (255) DEFAULT (0x) NOT NULL ,
 	[group_desc_options] [int] DEFAULT (0) NOT NULL ,
 	[group_desc_uid] [varchar] (5) DEFAULT ('') NOT NULL ,
 	[group_display] [int] DEFAULT (0) NOT NULL ,
@@ -1495,7 +1495,7 @@ CREATE TABLE [phpbb_users] (
 	[user_avatar_height] [int] DEFAULT (0) NOT NULL ,
 	[user_sig] [text] DEFAULT ('') NOT NULL ,
 	[user_sig_bbcode_uid] [varchar] (5) DEFAULT ('') NOT NULL ,
-	[user_sig_bbcode_bitfield] [varbinary] DEFAULT (255) NOT NULL ,
+	[user_sig_bbcode_bitfield] [varbinary] (255) DEFAULT (0x) NOT NULL ,
 	[user_from] [varchar] (100) DEFAULT ('') NOT NULL ,
 	[user_icq] [varchar] (15) DEFAULT ('') NOT NULL ,
 	[user_aim] [varchar] (255) DEFAULT ('') NOT NULL ,