diff --git a/OpenRa.Game/TileSheetBuilder.cs b/OpenRa.Game/TileSheetBuilder.cs
index e8f26ac01e..0c3c98b554 100644
--- a/OpenRa.Game/TileSheetBuilder.cs
+++ b/OpenRa.Game/TileSheetBuilder.cs
@@ -10,7 +10,7 @@ namespace OpenRa.Game
 
 	public delegate T Provider<T>();
 
-	class TileSheetBuilder<T>
+	public class TileSheetBuilder<T>
 		where T : class
 	{
 		readonly Size pageSize;