diff --git a/OwnChar.App.Desktop/UI/Windows/MainWindow.cs b/OwnChar.App.Desktop/UI/Windows/MainWindow.cs
index b90fa02..061d1ae 100644
--- a/OwnChar.App.Desktop/UI/Windows/MainWindow.cs
+++ b/OwnChar.App.Desktop/UI/Windows/MainWindow.cs
@@ -1,5 +1,6 @@
 using OwnChar.App.Desktop.Api;
 using OwnChar.App.Desktop.Api.Parameters;
+using OwnChar.Data;
 using OwnChar.Manager;
 using Pilz.Plugins.Advanced;
 using Pilz.Plugins.Advanced.UI.Telerik;
@@ -12,7 +13,7 @@ namespace OwnChar.App.Desktop.UI.Windows
 {
     public partial class MainWindow : RadTabbedForm
     {
-        private readonly OwnCharManager? manager = new();
+        private readonly OwnCharManager? manager = new(new JsonFileDataProvider());
 
         public MainWindowApi Api { get; }