diff --git a/src/saveload/misc_sl.cpp b/src/saveload/misc_sl.cpp
--- a/src/saveload/misc_sl.cpp
+++ b/src/saveload/misc_sl.cpp
@@ -135,7 +135,7 @@ struct DATEChunkHandler : ChunkHandler {
 		this->LoadCommon(_date_check_desc, _date_check_sl_compat);
 
 		if (IsSavegameVersionBefore(SLV_31)) {
-			_load_check_data.current_date += DAYS_TILL_ORIGINAL_BASE_YEAR;
+			_load_check_data.current_date += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
 		}
 	}
 };