diff --git a/src/Avalonia.Controls/Window.cs b/src/Avalonia.Controls/Window.cs
index a3c70d5b821..bbaed03dd47 100644
--- a/src/Avalonia.Controls/Window.cs
+++ b/src/Avalonia.Controls/Window.cs
@@ -976,7 +976,7 @@ private void SetWindowStartupLocation(Window? owner = null)
                     PixelSize.FromSize(ownerSize, scaling));
                 var childRect = ownerRect.CenterRect(rect);
 
-                if (Screens.ScreenFromWindow(this)?.WorkingArea is { } constraint)
+                if (Screens.ScreenFromWindow(owner)?.WorkingArea is { } constraint)
                 {
                     var maxX = constraint.Right - rect.Width;
                     var maxY = constraint.Bottom - rect.Height;