Index: trunk/src/org/openstreetmap/josm/data/coor/Coordinate.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/coor/Coordinate.java	(revision 455)
+++ trunk/src/org/openstreetmap/josm/data/coor/Coordinate.java	(revision 456)
@@ -1,4 +1,6 @@
 // License: GPL. Copyright 2007 by Immanuel Scholz and others
 package org.openstreetmap.josm.data.coor;
+
+import java.io.Serializable;
 
 
@@ -16,5 +18,5 @@
  * @author imi
  */ 
-abstract class Coordinate {
+abstract class Coordinate implements Serializable {
 
 	/**