diff --git a/lib/db/mysql.php b/lib/db/mysql.php
index af6c043d0a2..2829fb27492 100644
--- a/lib/db/mysql.php
+++ b/lib/db/mysql.php
@@ -1729,6 +1729,10 @@ function main_upgrade($oldversion=0) {
             set_config('enrol', 'manual');
         }
     }
+    
+    if ($oldversion < 2006031600) {
+        execute_sql(" ALTER TABLE `{$CFG->prefix}grade_category` CHANGE `weight` `weight` decimal(5,2) default '0.00';");
+    }
 
     return $result;
 }
diff --git a/lib/db/mysql.sql b/lib/db/mysql.sql
index 131b84ddf2d..d5c09a4eebd 100644
--- a/lib/db/mysql.sql
+++ b/lib/db/mysql.sql
@@ -291,7 +291,7 @@ CREATE TABLE `prefix_grade_category` (
   `drop_x_lowest` int(10) unsigned NOT NULL default '0',
   `bonus_points` int(10) unsigned NOT NULL default '0',
   `hidden` int(10) unsigned NOT NULL default '0',
-  `weight` decimal(4,2) default '0.00',
+  `weight` decimal(5,2) default '0.00',
   PRIMARY KEY  (`id`),
   KEY `courseid` (`courseid`)
 ) TYPE=MyISAM ;
diff --git a/version.php b/version.php
index df40846dc99..87f5a7dbf9b 100644
--- a/version.php
+++ b/version.php
@@ -6,7 +6,7 @@
 // This is compared against the values stored in the database to determine
 // whether upgrades should be performed (see lib/db/*.php)
 
-   $version = 2006031400;  // YYYYMMDD = date
+   $version = 2006031600;  // YYYYMMDD = date
                            //       XY = increments within a single day
 
    $release = '1.6 development';    // Human-friendly version name