diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -215,7 +215,7 @@ struct GameOptionsWindow : Window {
 					if (i == CURRENCY_CUSTOM) continue;
 					*list->Append() = new DropDownListStringItem(*items, i, HasBit(disabled, i));
 				}
-				QSortT(list->Begin(), list->Length(), DropDownListStringItem::NatSortFunc);
+				QSortT(list->Begin(), list->size(), DropDownListStringItem::NatSortFunc);
 
 				/* Append custom currency at the end */
 				*list->Append() = new DropDownListItem(-1, false); // separator line
@@ -253,9 +253,9 @@ struct GameOptionsWindow : Window {
 					int result = _nb_orig_names + i;
 					*list->Append() = new DropDownListStringItem(_grf_names[i], result, enabled_item != result && enabled_item >= 0);
 				}
-				QSortT(list->Begin(), list->Length(), DropDownListStringItem::NatSortFunc);
+				QSortT(list->Begin(), list->size(), DropDownListStringItem::NatSortFunc);
 
-				int newgrf_size = list->Length();
+				int newgrf_size = list->size();
 				/* Insert newgrf_names at the top of the list */
 				if (newgrf_size > 0) {
 					*list->Append() = new DropDownListItem(-1, false); // separator line
@@ -266,7 +266,7 @@ struct GameOptionsWindow : Window {
 				for (int i = 0; i < _nb_orig_names; i++) {
 					*list->Append() = new DropDownListStringItem(STR_GAME_OPTIONS_TOWN_NAME_ORIGINAL_ENGLISH + i, i, enabled_item != i && enabled_item >= 0);
 				}
-				QSortT(list->Begin() + newgrf_size, list->Length() - newgrf_size, DropDownListStringItem::NatSortFunc);
+				QSortT(list->Begin() + newgrf_size, list->size() - newgrf_size, DropDownListStringItem::NatSortFunc);
 				break;
 			}
 
@@ -282,11 +282,11 @@ struct GameOptionsWindow : Window {
 
 			case WID_GO_LANG_DROPDOWN: { // Setup interface language dropdown
 				list = new DropDownList();
-				for (uint i = 0; i < _languages.Length(); i++) {
+				for (uint i = 0; i < _languages.size(); i++) {
 					if (&_languages[i] == _current_language) *selected_index = i;
 					*list->Append() = new DropDownListStringItem(SPECSTR_LANGUAGE_START + i, i, false);
 				}
-				QSortT(list->Begin(), list->Length(), DropDownListStringItem::NatSortFunc);
+				QSortT(list->Begin(), list->size(), DropDownListStringItem::NatSortFunc);
 				break;
 			}