diff --git a/src/object_base.h b/src/object_base.h
--- a/src/object_base.h
+++ b/src/object_base.h
@@ -87,6 +87,14 @@ protected:
 #define FOR_ALL_OBJECTS_FROM(var, start) FOR_ALL_ITEMS_FROM(Object, object_index, var, start)
 #define FOR_ALL_OBJECTS(var) FOR_ALL_OBJECTS_FROM(var, 0)
 
-extern SmallVector<TileArea, 4> _cleared_object_areas;
+/**
+ * Keeps track of removed objects during execution/testruns of commands.
+ */
+struct ClearedObjectArea {
+	TileIndex first_tile;  ///< The first tile being cleared, which then causes the whole object to be cleared.
+	TileArea area;         ///< The area of the object.
+};
+
+extern SmallVector<ClearedObjectArea, 4> _cleared_object_areas;
 
 #endif /* OBJECT_BASE_H */