diff --git a/ExtLibs/GMap.NET.WindowsForms/GMap.NET.WindowsForms/GMapMarker.cs b/ExtLibs/GMap.NET.WindowsForms/GMap.NET.WindowsForms/GMapMarker.cs
index d74dda438a..40b269a558 100644
--- a/ExtLibs/GMap.NET.WindowsForms/GMap.NET.WindowsForms/GMapMarker.cs
+++ b/ExtLibs/GMap.NET.WindowsForms/GMap.NET.WindowsForms/GMapMarker.cs
@@ -39,7 +39,7 @@ internal set
       }
 
       private PointLatLng position;
-      public PointLatLng Position
+      public virtual PointLatLng Position
       {
          get
          {