diff --git a/src/cheat_gui.cpp b/src/cheat_gui.cpp
--- a/src/cheat_gui.cpp
+++ b/src/cheat_gui.cpp
@@ -108,7 +108,7 @@ static int32 ClickChangeDateCheat(int32 
 	if (p1 == _cur_year) return _cur_year;
 
 	Date new_date = ConvertYMDToDate(p1, ymd.month, ymd.day);
-	LinkGraphSchedule::Instance()->ShiftDates(new_date - _date);
+	LinkGraphSchedule::instance.ShiftDates(new_date - _date);
 	SetDate(new_date, _date_fract);
 	EnginesMonthlyLoop();
 	SetWindowDirty(WC_STATUS_BAR, 0);