diff --git a/deluge/ui/gtk3/mainwindow.py b/deluge/ui/gtk3/mainwindow.py
index 8200d9535..3ac8e066c 100644
--- a/deluge/ui/gtk3/mainwindow.py
+++ b/deluge/ui/gtk3/mainwindow.py
@@ -242,7 +242,7 @@ class MainWindow(component.Component):
                 if response_id == Gtk.ResponseType.OK:
                     if (
                         self.config['tray_password']
-                        == sha(dialog.get_password()).hexdigest()
+                        == sha(decode_bytes(dialog.get_password()).encode()).hexdigest()
                     ):
                         quit_gtkui()