diff --git a/po/POTFILES b/po/POTFILES
index f6f6bb7..8e149a5 100644
--- a/po/POTFILES
+++ b/po/POTFILES
@@ -12,7 +12,6 @@ tuhigui/application.py
 tuhigui/config.py
 tuhigui/drawing.py
 tuhigui/drawingperspective.py
-tuhigui/setupdialog.py
 tuhigui/svg.py
 tuhigui/tuhi.py
 tuhigui/window.py
diff --git a/tuhigui/setupdialog.py b/tuhigui/setupdialog.py
deleted file mode 100644
index e597795..0000000
--- a/tuhigui/setupdialog.py
+++ /dev/null
@@ -1,61 +0,0 @@
-#!/usr/bin/env python3
-#
-#  This program is free software; you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation; either version 2 of the License, or
-#  (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-
-from gettext import gettext as _
-from gi.repository import GObject, Gtk
-
-import gi
-gi.require_version("Gtk", "3.0")
-
-
-@Gtk.Template(resource_path="/org/freedesktop/TuhiGui/ui/SetupPerspective.ui")
-class SetupDialog(Gtk.Dialog):
-    __gtype_name__ = "SetupDialog"
-    __gsignals__ = {
-        'new-device':
-            (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT,)),
-    }
-
-    stack = Gtk.Template.Child()
-    label_devicename_p1 = Gtk.Template.Child()
-    btn_quit = Gtk.Template.Child()
-
-    def __init__(self, tuhi, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self._tuhi = tuhi
-        self._sig = tuhi.connect('unregistered-device', self._on_unregistered_device)
-        tuhi.start_search()
-        self.device = None
-
-    def _on_unregistered_device(self, tuhi, device):
-        tuhi.disconnect(self._sig)
-
-        self.label_devicename_p1.set_text(_(f'Connecting to {device.name}'))
-        self.stack.set_visible_child_name('page1')
-        self._sig = device.connect('button-press-required', self._on_button_press_required)
-        device.register()
-
-    def _on_button_press_required(self, tuhi, device):
-        tuhi.disconnect(self._sig)
-
-        self.stack.set_visible_child_name('page2')
-        self._sig = device.connect('registered', self._on_registered)
-
-    def _on_registered(self, tuhi, device):
-        tuhi.disconnect(self._sig)
-        self.device = device
-        self.response(Gtk.ResponseType.OK)
-
-    @GObject.Property
-    def name(self):
-        return "setup_dialog"
diff --git a/tuhigui/window.py b/tuhigui/window.py
index 4a73d1d..475b418 100644
--- a/tuhigui/window.py
+++ b/tuhigui/window.py
@@ -11,9 +11,9 @@
 #  GNU General Public License for more details.
 #
 
+from gettext import gettext as _
 from gi.repository import Gtk, Gio, GLib, GObject
 
-from .setupdialog import SetupDialog
 from .drawingperspective import DrawingPerspective
 from .tuhi import TuhiKeteManager
 from .config import Config
@@ -71,6 +71,52 @@ class ErrorPerspective(Gtk.Box):
         return "error_perspective"
 
 
+@Gtk.Template(resource_path="/org/freedesktop/TuhiGui/ui/SetupPerspective.ui")
+class SetupDialog(Gtk.Dialog):
+    '''
+    The setup dialog when we don't yet have a registered device with Tuhi.
+    '''
+    __gtype_name__ = "SetupDialog"
+    __gsignals__ = {
+        'new-device':
+            (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT,)),
+    }
+
+    stack = Gtk.Template.Child()
+    label_devicename_p1 = Gtk.Template.Child()
+    btn_quit = Gtk.Template.Child()
+
+    def __init__(self, tuhi, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._tuhi = tuhi
+        self._sig = tuhi.connect('unregistered-device', self._on_unregistered_device)
+        tuhi.start_search()
+        self.device = None
+
+    def _on_unregistered_device(self, tuhi, device):
+        tuhi.disconnect(self._sig)
+
+        self.label_devicename_p1.set_text(_(f'Connecting to {device.name}'))
+        self.stack.set_visible_child_name('page1')
+        self._sig = device.connect('button-press-required', self._on_button_press_required)
+        device.register()
+
+    def _on_button_press_required(self, tuhi, device):
+        tuhi.disconnect(self._sig)
+
+        self.stack.set_visible_child_name('page2')
+        self._sig = device.connect('registered', self._on_registered)
+
+    def _on_registered(self, tuhi, device):
+        tuhi.disconnect(self._sig)
+        self.device = device
+        self.response(Gtk.ResponseType.OK)
+
+    @GObject.Property
+    def name(self):
+        return "setup_dialog"
+
+
 @Gtk.Template(resource_path='/org/freedesktop/TuhiGui/ui/MainWindow.ui')
 class MainWindow(Gtk.ApplicationWindow):
     __gtype_name__ = 'MainWindow'