diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Constants.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Constants.kt
index 621e3c872..8463bdd97 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Constants.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Constants.kt
@@ -84,7 +84,7 @@ const val EVENT_LIST_PERIOD = "event_list_period"
 const val WEEK_NUMBERS = "week_numbers"
 const val START_WEEKLY_AT = "start_weekly_at"
 const val START_WEEK_WITH_CURRENT_DAY = "start_week_with_current_day"
-const val FIRST_DAY_OF_WEEK = "start_week_on"
+const val FIRST_DAY_OF_WEEK = "first_day_of_week"
 const val SHOW_MIDNIGHT_SPANNING_EVENTS_AT_TOP = "show_midnight_spanning_events_at_top"
 const val ALLOW_CUSTOMIZE_DAY_COUNT = "allow_customise_day_count"
 const val VIBRATE = "vibrate"