Index: dbus-glib-0.74/dbus/dbus-gproxy.c
===================================================================
--- dbus-glib-0.74.orig/dbus/dbus-gproxy.c
+++ dbus-glib-0.74/dbus/dbus-gproxy.c
@@ -1239,8 +1239,15 @@ dbus_g_proxy_manager_filter (DBusConnect
 						  dbus_message_get_interface (message));
 
 	      owner_list = g_hash_table_lookup (manager->proxy_lists, tri);
-	      if (owner_list != NULL)
-		full_list = g_slist_concat (full_list, g_slist_copy (owner_list->proxies));
+	      if (owner_list != NULL) {
+	        GSList *elt;
+
+	        /* Ignore duplicates when adding to full_list */
+	        for (elt = owner_list->proxies; elt; elt = g_slist_next (elt)) {
+	          if (!g_slist_find (full_list, elt->data))
+	            full_list = g_slist_append (full_list, elt->data);
+	        }
+	      }
 	      g_free (tri);
 	    }
 	}