diff --git a/libs/surfaces/osc/osc_server.cc b/libs/surfaces/osc/osc_server.cc
index 5d0a2daa4d..683ec7ff1e 100644
--- a/libs/surfaces/osc/osc_server.cc
+++ b/libs/surfaces/osc/osc_server.cc
@@ -99,6 +99,8 @@ ControlOSC::set_active (bool yn)
 		}
 #endif
 
+		cerr << "OSC @ " << get_server_url () << endl;
+
 		register_callbacks();
 	
 		on_session_load ();
diff --git a/libs/surfaces/osc/osc_server.h b/libs/surfaces/osc/osc_server.h
index d3d4516d4d..9283b21160 100644
--- a/libs/surfaces/osc/osc_server.h
+++ b/libs/surfaces/osc/osc_server.h
@@ -85,6 +85,7 @@ class ControlOSC : public ARDOUR::ControlProtocol, public AbstractUI<OSCRequest>
 
 #define PATH_CALLBACK1(name,type) \
         static int _ ## name (const char *path, const char *types, lo_arg **argv, int argc, void *data, void *user_data) { \
+                cerr << "callback from OSC\n"; \
 		return static_cast<ControlOSC*>(user_data)->cb_ ## name (path, types, argv, argc, data); \
         } \
         int cb_ ## name (const char *path, const char *types, lo_arg **argv, int argc, void *data) { \