diff --git a/libs/surfaces/generic_midi/generic_midi_control_protocol.cc b/libs/surfaces/generic_midi/generic_midi_control_protocol.cc
index 3808b8c7f7..cf179cb86c 100644
--- a/libs/surfaces/generic_midi/generic_midi_control_protocol.cc
+++ b/libs/surfaces/generic_midi/generic_midi_control_protocol.cc
@@ -146,6 +146,8 @@ GenericMidiControlProtocol::GenericMidiControlProtocol (Session& s)
 
 GenericMidiControlProtocol::~GenericMidiControlProtocol ()
 {
+	set_active (false);
+
 	if (_input_port) {
 		DEBUG_TRACE (DEBUG::GenericMidi, string_compose ("unregistering input port %1\n", boost::shared_ptr<ARDOUR::Port>(_input_port)->name()));
 		Glib::Threads::Mutex::Lock em (AudioEngine::instance()->process_lock());