diff --git a/MapControl/Shared/PolygonCollection.cs b/MapControl/Shared/PolygonCollection.cs
index 5c10b4bf..e1d0f4e8 100644
--- a/MapControl/Shared/PolygonCollection.cs
+++ b/MapControl/Shared/PolygonCollection.cs
@@ -2,7 +2,6 @@
 // Copyright © Clemens Fischer
 // Licensed under the Microsoft Public License (Ms-PL)
 
-using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;