diff --git a/src/Shared/HandyControl_Shared/Controls/Window/MessageBox.cs b/src/Shared/HandyControl_Shared/Controls/Window/MessageBox.cs
index 91a51991..8586d12d 100644
--- a/src/Shared/HandyControl_Shared/Controls/Window/MessageBox.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Window/MessageBox.cs
@@ -457,7 +457,7 @@ public sealed class MessageBox : Window
         {
             Message = messageBoxText,
             Owner = ownerWindow,
-            WindowStartupLocation = WindowStartupLocation.CenterScreen,
+            WindowStartupLocation = ownerIsNull ? WindowStartupLocation.CenterScreen : WindowStartupLocation.CenterOwner,
             ShowTitle = true,
             Title = caption ?? string.Empty,
             Topmost = ownerIsNull,