diff --git a/phpBB/install/schemas/mysql_schema.sql b/phpBB/install/schemas/mysql_schema.sql
index 164aeb15f2..94cd5097b9 100644
--- a/phpBB/install/schemas/mysql_schema.sql
+++ b/phpBB/install/schemas/mysql_schema.sql
@@ -352,14 +352,14 @@ CREATE TABLE phpbb_modules (
   module_id mediumint(8) UNSIGNED NOT NULL auto_increment,
   module_enabled tinyint(1) UNSIGNED DEFAULT '1' NOT NULL,
   module_display tinyint(1) UNSIGNED DEFAULT '1' NOT NULL,
-  module_name varchar(255) UNSIGNED DEFAULT '' NOT NULL,
-  module_class varchar(10) UNSIGNED DEFAULT '' NOT NULL,
+  module_name varchar(255) DEFAULT '' NOT NULL,
+  module_class varchar(10) DEFAULT '' NOT NULL,
   parent_id mediumint(8) UNSIGNED DEFAULT '0' NOT NULL,
   left_id mediumint(8) UNSIGNED DEFAULT '0' NOT NULL,
   right_id mediumint(8) UNSIGNED DEFAULT '0' NOT NULL,
-  module_langname varchar(255) UNSIGNED DEFAULT '' NOT NULL,
-  module_mode varchar(255) UNSIGNED DEFAULT '' NOT NULL,
-  module_auth varchar(255) UNSIGNED DEFAULT '' NOT NULL,
+  module_langname varchar(255) DEFAULT '' NOT NULL,
+  module_mode varchar(255) DEFAULT '' NOT NULL,
+  module_auth varchar(255) DEFAULT '' NOT NULL,
   PRIMARY KEY  (module_id),
   KEY left_right_id (left_id, right_id),
   KEY module_enabled (module_enabled)