Index: schema.php
===================================================================
--- schema.php	(revision 32468)
+++ schema.php	(working copy)
@@ -130,7 +130,7 @@
 ) $charset_collate;
 CREATE TABLE $wpdb->options (
   option_id bigint(20) unsigned NOT NULL auto_increment,
-  option_name varchar(64) NOT NULL default '',
+  option_name varchar(255) NOT NULL default '',
   option_value longtext NOT NULL,
   autoload varchar(20) NOT NULL default 'yes',
   PRIMARY KEY  (option_id),
Index: upgrade.php
===================================================================
--- upgrade.php	(revision 32468)
+++ upgrade.php	(working copy)
@@ -1486,6 +1486,10 @@
 		foreach ( $comments as $comment ) {
 			wp_delete_comment( $comment->comment_ID, true );
 		}
+
+   	$wpdb->hide_errors();
+   	$wpdb->query("ALTER TABLE {$wpdb->options} MODIFY option_name VARCHAR(255)");
+   	$wpdb->show_errors();
 	}
 }