diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index b3a6784d13..1af1efacae 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -186,7 +186,7 @@ SMFSource::write_unlocked (MidiRingBuffer<nframes_t>& source, sframes_t position
 
 	while (true) {
 		bool ret = source.peek_time(&event_time);
-		g_debug ("event_time: %u, last_write_end: %lu, duration: %u", event_time, _last_write_end, duration);
+		g_debug ("position: %lu, event_time: %u, last_write_end: %lu, duration: %u", position, event_time, _last_write_end, duration);
 		if (!ret || event_time > _last_write_end + duration) {
 			if (!ret) g_debug ("peek failed");
 			if (event_time > _last_write_end + duration) g_debug ("event_time: %u > last_write_end: %lu + duration: %u", event_time, _last_write_end, duration);