From 5189509817724d49bb7baddcf7b03c8dae652af8 Mon Sep 17 00:00:00 2001
From: Benedikt Schroeder <benedikt.schroeder@outlook.de>
Date: Thu, 20 Aug 2020 11:27:09 +0200
Subject: [PATCH] Fix #4521

---
 src/Avalonia.Controls/Utils/BorderRenderHelper.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/Utils/BorderRenderHelper.cs b/src/Avalonia.Controls/Utils/BorderRenderHelper.cs
index 438cbc8b27..3128753781 100644
--- a/src/Avalonia.Controls/Utils/BorderRenderHelper.cs
+++ b/src/Avalonia.Controls/Utils/BorderRenderHelper.cs
@@ -141,7 +141,7 @@ namespace Avalonia.Controls.Utils
             var radiusY = keypoints.RightTop.Y - boundRect.TopRight.Y;
             if (radiusX != 0 || radiusY != 0)
             {
-                context.ArcTo(keypoints.RightTop, new Size(radiusY, radiusY), 0, false, SweepDirection.Clockwise);
+                context.ArcTo(keypoints.RightTop, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
             }
 
             // Right