diff --git a/src/table/settings/world_settings.ini b/src/table/settings/world_settings.ini
--- a/src/table/settings/world_settings.ini
+++ b/src/table/settings/world_settings.ini
@@ -122,9 +122,9 @@ cat      = SC_BASIC
 [SDT_VAR]
 var      = game_creation.starting_year
 type     = SLE_INT32
-def      = DEF_START_YEAR
-min      = MIN_YEAR
-max      = MAX_YEAR
+def      = CalendarTime::DEF_START_YEAR
+min      = CalendarTime::MIN_YEAR
+max      = CalendarTime::MAX_YEAR
 interval = 1
 str      = STR_CONFIG_SETTING_STARTING_YEAR
 strval   = STR_JUST_INT
@@ -135,9 +135,9 @@ var      = game_creation.ending_year
 type     = SLE_INT32
 from     = SLV_ENDING_YEAR
 flags    = SF_GUI_0_IS_SPECIAL
-def      = DEF_END_YEAR
-min      = MIN_YEAR
-max      = MAX_YEAR - 1
+def      = CalendarTime::DEF_END_YEAR
+min      = CalendarTime::MIN_YEAR
+max      = CalendarTime::MAX_YEAR - 1
 interval = 1
 str      = STR_CONFIG_SETTING_ENDING_YEAR
 strhelp  = STR_CONFIG_SETTING_ENDING_YEAR_HELPTEXT