diff --git a/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml b/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml
index 043a7a72ce..d43c40b1e7 100644
--- a/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml
+++ b/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml
@@ -6,6 +6,7 @@
         xmlns:p="clr-namespace:ImageResizer.Properties"
         xmlns:sys="clr-namespace:System;assembly=mscorlib"
         xmlns:ui="http://schemas.modernwpf.com/2019"
+        ContentRendered="WindowContentRendered"
         MinWidth="560"
         MinHeight="340"
         ui:WindowHelper.UseModernWindowStyle="True"
diff --git a/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml.cs b/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml.cs
index a514aa1b5e..30b398813f 100644
--- a/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml.cs
+++ b/src/modules/imageresizer/ui/Views/AdvancedWindow.xaml.cs
@@ -25,5 +25,11 @@ namespace ImageResizer.Views
             Process.Start(e.Uri.ToString());
             e.Handled = true;
         }
+
+        // Fix for black outline WPF bug when a window uses custom chrome. More info here https://stackoverflow.com/questions/29207331/wpf-window-with-custom-chrome-has-unwanted-outline-on-right-and-bottom
+        private void WindowContentRendered(object sender, System.EventArgs e)
+        {
+            InvalidateVisual();
+        }
     }
 }