diff --git a/Pilz.UI.Telerik/Dialogs/RadDialogBase.cs b/Pilz.UI.Telerik/Dialogs/RadDialogBase.cs
index 2950bde..ef2cdd0 100644
--- a/Pilz.UI.Telerik/Dialogs/RadDialogBase.cs
+++ b/Pilz.UI.Telerik/Dialogs/RadDialogBase.cs
@@ -12,7 +12,7 @@ public partial class RadDialogBase : RadForm
         FormClosed += DialogBaseForm_FormClosed;
     }
 
-    public RadDialogBase(RadFlyoutBase? dialogPanel) : this()
+    public RadDialogBase(RadFlyoutBase dialogPanel) : this()
     {
         DialogPanel = dialogPanel;
     }