diff --git a/daemon/virtualizer.c b/daemon/virtualizer.c
index 075a00f9..f6b2f347 100644
--- a/daemon/virtualizer.c
+++ b/daemon/virtualizer.c
@@ -638,6 +638,8 @@ port_appeared(
       ladish_port_set_app(port, app_uuid);
     }
 
+    ladish_dict_set(ladish_port_get_dict(port), URI_CANVAS_A2J, is_a2j ? "yes" : "no");
+
     ladish_client_set_jack_id(vclient, client_id);
     ladish_graph_adjust_port(vgraph, port, type, flags);
     ladish_graph_show_port(vgraph, port);
@@ -661,6 +663,8 @@ port_appeared(
     ladish_port_set_app(port, app_uuid);
   }
 
+  ladish_dict_set(ladish_port_get_dict(port), URI_CANVAS_A2J, is_a2j ? "yes" : "no");
+
   if (!ladish_graph_add_port(virtualizer_ptr->jack_graph, jack_client, port, jack_port_name, type, flags, false))
   {
     log_error("ladish_graph_add_port() failed.");
diff --git a/dbus_constants.h b/dbus_constants.h
index 09be12e2..632d936c 100644
--- a/dbus_constants.h
+++ b/dbus_constants.h
@@ -71,6 +71,7 @@
 #define URI_CANVAS_HEIGHT   "http://ladish.org/ns/canvas/height"
 #define URI_CANVAS_X        "http://ladish.org/ns/canvas/x"
 #define URI_CANVAS_Y        "http://ladish.org/ns/canvas/y"
+#define URI_CANVAS_A2J      "http://ladish.org/ns/a2j"
 
 #define JACKDBUS_PORT_IS_INPUT(flags) (((flags) & JACKDBUS_PORT_FLAG_INPUT) != 0)
 #define JACKDBUS_PORT_IS_OUTPUT(flags) (((flags) & JACKDBUS_PORT_FLAG_OUTPUT) != 0)