diff --git a/colourterm/mainwindow.py b/colourterm/mainwindow.py
index 99c6b7e..5217f37 100644
--- a/colourterm/mainwindow.py
+++ b/colourterm/mainwindow.py
@@ -201,11 +201,14 @@ class MainWindow(QtGui.QMainWindow, UiMainWindow):
 
     def on_open_action_triggered(self):
         self.connect_dialog.update_port_combobox()
+        settings = QtCore.QSettings()
+        self.connect_dialog.port_edit.setEditText(unicode(settings.value(u'previous-port', u'').toString()))
         if self.connect_dialog.exec_() == QtGui.QDialog.Accepted:
             if not self.device_closed:
                 self.device_closed = True
                 self.device.close()
             try:
+                settings.setValue(u'previous-port', self.connect_dialog.get_port())
                 self.device = Serial(
                     port=self.connect_dialog.get_port(),
                     baudrate=self.connect_dialog.get_baud(),