diff --git a/src/object_cmd.cpp b/src/object_cmd.cpp
--- a/src/object_cmd.cpp
+++ b/src/object_cmd.cpp
@@ -209,11 +209,11 @@ CommandCost CmdBuildObject(TileIndex til
 	if (type >= NUM_OBJECTS) return CMD_ERROR;
 	uint8 view = GB(p2, 0, 2);
 	const ObjectSpec *spec = ObjectSpec::Get(type);
-	if (_game_mode == GM_NORMAL && !spec->IsAvailable()) return CMD_ERROR;
-	if (_game_mode == GM_EDITOR && !spec->WasEverAvailable()) return CMD_ERROR;
+	if (_game_mode == GM_NORMAL && !spec->IsAvailable() && !_generating_world) return CMD_ERROR;
+	if ((_game_mode == GM_EDITOR || _generating_world) && !spec->WasEverAvailable()) return CMD_ERROR;
 
-	if (spec->flags & OBJECT_FLAG_ONLY_IN_SCENEDIT && (_game_mode != GM_EDITOR || _current_company != OWNER_NONE)) return CMD_ERROR;
-	if (spec->flags & OBJECT_FLAG_ONLY_IN_GAME && (_game_mode != GM_NORMAL || _current_company > MAX_COMPANIES)) return CMD_ERROR;
+	if ((spec->flags & OBJECT_FLAG_ONLY_IN_SCENEDIT) != 0 && ((!_generating_world && _game_mode != GM_EDITOR) || _current_company != OWNER_NONE)) return CMD_ERROR;
+	if ((spec->flags & OBJECT_FLAG_ONLY_IN_GAME) != 0 && (_generating_world || _game_mode != GM_NORMAL || _current_company > MAX_COMPANIES)) return CMD_ERROR;
 	if (view >= spec->views) return CMD_ERROR;
 
 	if (!Object::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_OBJECTS);