diff --git a/TrueCraft.Client/ChunkConverter.cs b/TrueCraft.Client/ChunkConverter.cs
index 98df8f1..bcbeb71 100644
--- a/TrueCraft.Client/ChunkConverter.cs
+++ b/TrueCraft.Client/ChunkConverter.cs
@@ -104,7 +104,7 @@ namespace TrueCraft.Client
             Coordinates3D.West
         };
 
-        private struct RenderThreadState
+        private class RenderThreadState
         {
             public readonly List<VertexPositionNormalTexture> OpaqueVerticies;
             public readonly List<int> OpaqueIndicies;