diff --git a/briar-gtk/briar_gtk/container.py b/briar-gtk/briar_gtk/container.py
index 6a16ad87b121959dfb5df8057f5609d31c0704ea..e943d98f49074248989fbbba55990ada7348e696 100644
--- a/briar-gtk/briar_gtk/container.py
+++ b/briar-gtk/briar_gtk/container.py
@@ -16,4 +16,6 @@ class Container(Gtk.Overlay):
         self.builder = Gtk.Builder()
 
     def _add_from_resource(self, ui_filename):
-        self.builder.add_from_resource(os.path.join(RESOURCES_DIR, ui_filename))
+        self.builder.add_from_resource(
+            os.path.join(RESOURCES_DIR, ui_filename)
+        )
diff --git a/briar-gtk/briar_gtk/containers/registration.py b/briar-gtk/briar_gtk/containers/registration.py
index 253875f80819c25500dbae3a3899ed79cf9b911c..383b918f426aeef140d22e1b78e19f7712e1c8d5 100644
--- a/briar-gtk/briar_gtk/containers/registration.py
+++ b/briar-gtk/briar_gtk/containers/registration.py
@@ -140,6 +140,7 @@ class RegistrationContainer(Container):
         error_label = self.builder.get_object("passwords_error_label")
         self._show_error_message(error_label, error_message)
 
-    def _show_error_message(self, error_label, error_message):
+    @staticmethod
+    def _show_error_message(error_label, error_message):
         error_label.set_label(error_message)
         error_label.show()