Index: wp-includes/user.php
===================================================================
--- wp-includes/user.php	(revision 29554)
+++ wp-includes/user.php	(working copy)
@@ -1179,7 +1179,7 @@
 		$select_count = implode(', ', $select_count);
 
 		// Add the meta_value index to the selection list, then run the query.
-		$row = $wpdb->get_row( "SELECT $select_count, COUNT(*) FROM $wpdb->usermeta WHERE meta_key = '{$blog_prefix}capabilities'", ARRAY_N );
+		$row = $wpdb->get_row( "SELECT $select_count, COUNT(*) FROM $wpdb->usermeta JOIN $wpdb->users ON user_id = ID WHERE meta_key = '{$blog_prefix}capabilities'", ARRAY_N );
 
 		// Run the previous loop again to associate results with role names.
 		$col = 0;