Index: wp-includes/user.php
===================================================================
--- wp-includes/user.php	(revision 29735)
+++ wp-includes/user.php	(working copy)
@@ -618,12 +618,16 @@
 				";
 				$orderby = 'post_count';
 			} elseif ( 'ID' == $qv['orderby'] || 'id' == $qv['orderby'] ) {
-				$orderby = 'ID';
-			} elseif ( 'meta_value' == $qv['orderby'] ) {
-				$orderby = "$wpdb->usermeta.meta_value";
-			} else {
-				$orderby = 'user_login';
-			}
+                $orderby = 'ID';
+            } elseif ( 'meta_value' == $qv['orderby'] ) {
+                $orderby = "$wpdb->usermeta.meta_value";
+            } elseif ( 'include' == $qv['orderby'] && ! empty( $qv['include'] ) ) {
+				$include = esc_sql($qv['include']);
+				$include = implode( ",", $include );
+                $orderby = "FIELD( {$wpdb->users}.ID, {$include} )";
+            } else {
+                $orderby = 'user_login';
+            }
 		}
 
 		if ( empty( $orderby ) )