diff --git a/src/spriteloader/grf.hpp b/src/spriteloader/grf.hpp
--- a/src/spriteloader/grf.hpp
+++ b/src/spriteloader/grf.hpp
@@ -16,7 +16,9 @@
 
 /** Sprite loader for graphics coming from a (New)GRF. */
 class SpriteLoaderGrf : public SpriteLoader {
+	byte container_ver;
 public:
+	SpriteLoaderGrf(byte container_ver) : container_ver(container_ver) {}
 	bool LoadSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_pos, SpriteType sprite_type);
 };