diff --git a/Windows/Perspex.Direct2D1/Media/GeometryImpl.cs b/Windows/Perspex.Direct2D1/Media/GeometryImpl.cs
index d3f6263fdc..510b618533 100644
--- a/Windows/Perspex.Direct2D1/Media/GeometryImpl.cs
+++ b/Windows/Perspex.Direct2D1/Media/GeometryImpl.cs
@@ -45,6 +45,7 @@ namespace Perspex.Direct2D1.Media
                     if (this.transformed != null)
                     {
                         this.transformed.Dispose();
+                        this.transformed = null;
                     }
 
                     if (!value.IsIdentity)