diff --git a/src/currency.cpp b/src/currency.cpp
--- a/src/currency.cpp
+++ b/src/currency.cpp
@@ -13,7 +13,6 @@
 #include "currency.h"
 #include "news_func.h"
 #include "settings_type.h"
-#include "date_func.h"
 #include "string_type.h"
 #include "timer/timer.h"
 #include "timer/timer_game_calendar.h"
@@ -129,8 +128,8 @@ uint64 GetMaskOfAllowedCurrencies()
 	for (i = 0; i < CURRENCY_END; i++) {
 		Year to_euro = _currency_specs[i].to_euro;
 
-		if (to_euro != CF_NOEURO && to_euro != CF_ISEURO && _cur_year >= to_euro) continue;
-		if (to_euro == CF_ISEURO && _cur_year < 2000) continue;
+		if (to_euro != CF_NOEURO && to_euro != CF_ISEURO && TimerGameCalendar::year >= to_euro) continue;
+		if (to_euro == CF_ISEURO && TimerGameCalendar::year < 2000) continue;
 		SetBit(mask, i);
 	}
 	SetBit(mask, CURRENCY_CUSTOM); // always allow custom currency
@@ -144,7 +143,7 @@ static IntervalTimer<TimerGameCalendar> 
 {
 	if (_currency_specs[_settings_game.locale.currency].to_euro != CF_NOEURO &&
 			_currency_specs[_settings_game.locale.currency].to_euro != CF_ISEURO &&
-			_cur_year >= _currency_specs[_settings_game.locale.currency].to_euro) {
+			TimerGameCalendar::year >= _currency_specs[_settings_game.locale.currency].to_euro) {
 		_settings_game.locale.currency = 2; // this is the index of euro above.
 		AddNewsItem(STR_NEWS_EURO_INTRODUCTION, NT_ECONOMY, NF_NORMAL);
 	}