diff --git a/src/unmovable_cmd.cpp b/src/unmovable_cmd.cpp
--- a/src/unmovable_cmd.cpp
+++ b/src/unmovable_cmd.cpp
@@ -212,7 +212,7 @@ static void DrawTile_Unmovable(TileInfo 
 			palette = PLAYER_SPRITE_COLOR(GetTileOwner(ti->tile));
 
 			t = &_unmovable_display_datas[GetCompanyHQSection(ti->tile)];
-			DrawGroundSprite(t->ground_sprite, palette);
+			DrawGroundSprite(t->ground.sprite, palette);
 
 			foreach_draw_tile_seq(dtss, t->seq) {
 				AddSortableSpriteToDraw(