diff --git a/gtk2_ardour/recorder_ui.cc b/gtk2_ardour/recorder_ui.cc
index 290206a54f..7b750f0cf7 100644
--- a/gtk2_ardour/recorder_ui.cc
+++ b/gtk2_ardour/recorder_ui.cc
@@ -625,11 +625,11 @@ RecorderUI::update_io_widget_labels ()
 	uint32_t n_audio = 0;
 	uint32_t n_midi = 0;
 
-	std::set <boost::shared_ptr<InputPort>, InputPortPtrSort> ips;
+	InputPortSet ips;
 	for (InputPortMap::const_iterator i = _input_ports.begin (); i != _input_ports.end (); ++i) {
 		ips.insert (i->second);
 	}
-	for (set<boost::shared_ptr<InputPort> >::const_iterator i = ips.begin (); i != ips.end (); ++i) {
+	for (InputPortSet::const_iterator i = ips.begin (); i != ips.end (); ++i) {
 		boost::shared_ptr<InputPort> const& ip = *i;
 		switch (ip->data_type ()) {
 			case DataType::AUDIO:
@@ -708,14 +708,14 @@ RecorderUI::meter_area_layout ()
 	int row = 0;
 	int spc = 2;
 
-	std::set <boost::shared_ptr<InputPort>, InputPortPtrSort> ips;
+	InputPortSet ips;
 	for (InputPortMap::const_iterator i = _input_ports.begin (); i != _input_ports.end (); ++i) {
 		boost::shared_ptr<InputPort> const& ip = i->second;
 		ip->show ();
 		ips.insert (ip);
 	}
 
-	for (set<boost::shared_ptr<InputPort> >::const_iterator i = ips.begin (); i != ips.end (); ++i) {
+	for (InputPortSet::const_iterator i = ips.begin (); i != ips.end (); ++i) {
 		boost::shared_ptr<InputPort> const& ip = *i;
 		_meter_table.attach (*ip, col, col + 1, row, row + 1, SHRINK|FILL, SHRINK, spc, spc);
 
diff --git a/gtk2_ardour/recorder_ui.h b/gtk2_ardour/recorder_ui.h
index 42178e1a37..e0c3ce08aa 100644
--- a/gtk2_ardour/recorder_ui.h
+++ b/gtk2_ardour/recorder_ui.h
@@ -243,7 +243,8 @@ private:
 		}
 	};
 
-	typedef std::map<std::string, boost::shared_ptr<InputPort> > InputPortMap;
+	typedef std::map<std::string, boost::shared_ptr<InputPort> >     InputPortMap;
+	typedef std::set<boost::shared_ptr<InputPort>, InputPortPtrSort> InputPortSet;
 
 	RecRuler                     _ruler;
 	Gtk::EventBox                _space;