diff --git a/libs/surfaces/mackie/mackie_control_protocol.cc b/libs/surfaces/mackie/mackie_control_protocol.cc
index a2636f070c..f57d3a7e8c 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.cc
+++ b/libs/surfaces/mackie/mackie_control_protocol.cc
@@ -1598,7 +1598,7 @@ MackieControlProtocol::handle_button_event (Surface& surface, Button& button, Bu
 
 	/* lookup using the device-INDEPENDENT button ID */
 
-	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("now looking up button ID %1", button_id));
+	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("now looking up button ID %1\n", button_id));
 
 	ButtonMap::iterator b = button_map.find (button_id);
 
diff --git a/libs/surfaces/mackie/mcp_buttons.cc b/libs/surfaces/mackie/mcp_buttons.cc
index dcbaa5c34b..435c1b91b3 100644
--- a/libs/surfaces/mackie/mcp_buttons.cc
+++ b/libs/surfaces/mackie/mcp_buttons.cc
@@ -462,10 +462,12 @@ MackieControlProtocol::marker_release (Button &)
 	framepos_t where = session->audible_frame();
 
 	if (session->transport_stopped() && session->locations()->mark_at (where, session->frame_rate() / 100.0)) {
+		DEBUG_TRACE (DEBUG::MackieControl, "transport stopped, marker already exists\n");
 		return off;
 	}
 
 	session->locations()->next_available_name (markername,"marker");
+	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("adding marker called %1\n", markername));
 	add_marker (markername);
 
 	return off;