diff --git a/src/Module/Settings/Display.php b/src/Module/Settings/Display.php
index 0766d2a13..87134103f 100644
--- a/src/Module/Settings/Display.php
+++ b/src/Module/Settings/Display.php
@@ -219,7 +219,7 @@ class Display extends BaseSettings
 		];
 
 
-		$first_day_of_week = $this->pConfig->get($uid, 'system', 'first_day_of_week', 0);
+		$first_day_of_week = $this->pConfig->get($uid, 'calendar', 'first_day_of_week', 0);
 		$weekdays          = [
 			0 => $this->t('Sunday'),
 			1 => $this->t('Monday'),
diff --git a/src/Util/Temporal.php b/src/Util/Temporal.php
index f6805a922..24d7d7e23 100644
--- a/src/Util/Temporal.php
+++ b/src/Util/Temporal.php
@@ -238,7 +238,7 @@ class Temporal
 		bool $required = false): string
 	{
 		// First day of the week (0 = Sunday)
-		$firstDay = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'system', 'first_day_of_week', 0);
+		$firstDay = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'calendar', 'first_day_of_week', 0);
 
 		$lang = substr(DI::l10n()->getCurrentLang(), 0, 2);