diff --git a/src/org/jgroups/protocols/relay/RELAY2.java b/src/org/jgroups/protocols/relay/RELAY2.java
index 09be38fbc8..def16e11d4 100644
--- a/src/org/jgroups/protocols/relay/RELAY2.java
+++ b/src/org/jgroups/protocols/relay/RELAY2.java
@@ -790,15 +790,15 @@ protected void sendSiteUnreachableTo(Address src, String target_site) {
         }
         // send message back to the src node.
         Message msg=new EmptyMessage(src).setFlag(Flag.OOB)
-          .putHeader(id, new Relay2Header(SITE_UNREACHABLE).setSites(target_site));
+          .putHeader(id, new Relay2Header(SITE_UNREACHABLE).addToSites(target_site));
         down(msg);
     }
 
-    protected void sitesChange(boolean down, String ... sites) {
-        if(!broadcast_route_notifications || sites == null || sites.length == 0)
+    protected void sitesChange(boolean down, Set<String> sites) {
+        if(!broadcast_route_notifications || sites == null || sites.isEmpty())
             return;
         Relay2Header hdr=new Relay2Header(down? SITES_DOWN : SITES_UP, null, null)
-          .setSites(sites);
+          .addToSites(sites);
         down_prot.down(new EmptyMessage(null).putHeader(id, hdr));
     }