diff --git a/grocy/rootfs/etc/services.d/php-fpm/run b/grocy/rootfs/etc/services.d/php-fpm/run
index 79851a2..b200955 100644
--- a/grocy/rootfs/etc/services.d/php-fpm/run
+++ b/grocy/rootfs/etc/services.d/php-fpm/run
@@ -3,6 +3,7 @@
 # Home Assistant Community Add-on: Grocy
 # Runs the PHP-FPM daemon
 # ==============================================================================
+declare caldayweek
 export GROCY_CULTURE
 export GROCY_CURRENCY
 export GROCY_ENTRY_PAGE
@@ -42,8 +43,8 @@ if bashio::config.false 'features.tasks'; then
 fi
 
 if bashio::config.has_value 'tweaks.calendar_first_day_of_week'; then
-    GROCY_DAYWEEK=$(bashio::config 'tweaks.calendar_first_day_of_week')
-    export GROCY_CALENDAR_FIRST_DAY_OF_WEEK=${GROCY_DAYWEEK}
+    caldayweek=$(bashio::config 'tweaks.calendar_first_day_of_week')
+    export GROCY_CALENDAR_FIRST_DAY_OF_WEEK=${caldayweek}
 fi
 
 if bashio::config.false 'tweaks.chores_assignment'; then