diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index 43149aaab6..dfaabc2c89 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -463,9 +463,9 @@ SMFSource::append_event_samples (const Glib::Threads::Mutex::Lock& lock,
 		return;
 	}
 
-	 printf("SMFSource: %s - append_event_samples ID = %d time = %u, size = %u, data = ",
-	 name().c_str(), ev.id(), ev.time(), ev.size());
-	 for (size_t i=0; i < ev.size(); ++i) printf("%X ", ev.buffer()[i]); printf("\n");
+	// printf("SMFSource: %s - append_event_samples ID = %d time = %u, size = %u, data = ",
+	// name().c_str(), ev.id(), ev.time(), ev.size());
+	// for (size_t i=0; i < ev.size(); ++i) printf("%X ", ev.buffer()[i]); printf("\n");
 
 	if (ev.time() < _last_ev_time_samples) {
 		warning << string_compose(_("Skipping event with unordered sample time %1 < %2"),