--- calendar/gui/dialogs/comp-editor.c
+++ calendar/gui/dialogs/comp-editor.c
@@ -1771,6 +1771,14 @@ comp_editor_class_init (CompEditorClass *class)
 			      G_TYPE_NONE, 0);
 }
 
+static void 
+on_classification_changed (GtkRadioAction *action, GtkRadioAction *current, gpointer *data)
+{
+	CompEditor *editor = COMP_EDITOR (data);
+
+	comp_editor_set_changed (editor, TRUE);
+}
+
 static void
 comp_editor_init (CompEditor *editor)
 {
@@ -1820,7 +1828,7 @@ comp_editor_init (CompEditor *editor)
 		action_group, classification_radio_entries,
 		G_N_ELEMENTS (classification_radio_entries),
 		E_CAL_COMPONENT_CLASS_PUBLIC,
-		NULL, NULL);  /* no callback */
+		G_CALLBACK (on_classification_changed), editor);  /* no callback */
 	action = e_attachment_bar_recent_action_new (
 		E_ATTACHMENT_BAR (priv->attachment_bar),
 		"attach-recent", _("Recent _Documents"));