diff --git a/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs b/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs
index c47e648..0f66d75 100644
--- a/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs
+++ b/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs
@@ -84,8 +84,8 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI
         {
             WeakReferenceMessenger.Default.Unregister<CommonMessage>("RowDetailsVisibility");
             WeakReferenceMessenger.Default.Unregister<OpenDrawMessage>("OpenDraw");
-            WeakReferenceMessenger.Default.Unregister<LectotypeMessage>("Lectotype");
-            WeakReferenceMessenger.Default.Unregister<LectotypeMessage>("LectotypeSaved");
+            WeakReferenceMessenger.Default.Unregister<LectotypeMessage,string>("Lectotype", "Lectotype");
+            WeakReferenceMessenger.Default.Unregister<LectotypeMessage,string>("LectotypeSaved", "LectotypeSaved");
         }
         private void Window_Loaded(object sender, RoutedEventArgs e)
         {