Index: source/ariba/overlay/modules/OverlayInterface.h
===================================================================
--- source/ariba/overlay/modules/OverlayInterface.h	(revision 10572)
+++ source/ariba/overlay/modules/OverlayInterface.h	(revision 10573)
@@ -152,5 +152,5 @@
 	 * @return The node id of the next hop
 	 */
-	virtual const NodeID& getNextNodeId( const NodeID& id ) const;
+	virtual const NodeID& getNextNodeId( const NodeID& id ) const = 0;
 
 	//--- functions from CommunicationListener that we _can_ use as overlay ---