diff --git a/src/landscape.cpp b/src/landscape.cpp
--- a/src/landscape.cpp
+++ b/src/landscape.cpp
@@ -21,7 +21,6 @@
 #include "genworld.h"
 #include "fios.h"
 #include "error_func.h"
-#include "date_func.h"
 #include "timer/timer_game_calendar.h"
 #include "timer/timer_game_tick.h"
 #include "water.h"
@@ -613,8 +612,8 @@ byte GetSnowLine()
 {
 	if (_snow_line == nullptr) return _settings_game.game_creation.snow_line_height;
 
-	YearMonthDay ymd;
-	ConvertDateToYMD(TimerGameCalendar::date, &ymd);
+	TimerGameCalendar::YearMonthDay ymd;
+	TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::date, &ymd);
 	return _snow_line->table[ymd.month][ymd.day];
 }