diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc
index f58098d9d1..3b853bffce 100644
--- a/libs/ardour/session_midi.cc
+++ b/libs/ardour/session_midi.cc
@@ -720,6 +720,9 @@ Session::send_time_code_in_another_thread (bool full)
 		return;
 	}
 
+	cerr << "send " << (full ? "full" : "qtr") << " MTC message, _frames_per_smpte_frame = " 
+	     << _frames_per_smpte_frame << endl;
+
 	MIDIRequest* request = new MIDIRequest;
 
 	if (full) {