diff --git a/apps/www/registry/default/ui/calendar.tsx b/apps/www/registry/default/ui/calendar.tsx
index e04fe19511..6176d4267f 100644
--- a/apps/www/registry/default/ui/calendar.tsx
+++ b/apps/www/registry/default/ui/calendar.tsx
@@ -36,11 +36,12 @@ function Calendar({
         head_cell:
           "text-muted-foreground rounded-md w-9 font-normal text-[0.8rem]",
         row: "flex w-full mt-2",
-        cell: "h-9 w-9 text-center text-sm p-0 relative [&:has([aria-selected].day-range-end)]:rounded-r-md [&:has([aria-selected].day-outside)]:bg-accent/50 [&:has([aria-selected])]:bg-accent first:[&:has([aria-selected])]:rounded-l-md last:[&:has([aria-selected])]:rounded-r-md focus-within:relative focus-within:z-20",
+        cell: "h-9 w-9 text-center text-sm p-0 relative [&:has([aria-selected].day-range-start)]:rounded-l-md [&:has([aria-selected].day-range-end)]:rounded-r-md [&:has([aria-selected].day-outside)]:bg-accent/50 [&:has([aria-selected])]:bg-accent first:[&:has([aria-selected])]:rounded-l-md last:[&:has([aria-selected])]:rounded-r-md focus-within:relative focus-within:z-20",
         day: cn(
           buttonVariants({ variant: "ghost" }),
           "h-9 w-9 p-0 font-normal aria-selected:opacity-100"
         ),
+        day_range_start: "day-range-start",
         day_range_end: "day-range-end",
         day_selected:
           "bg-primary text-primary-foreground hover:bg-primary hover:text-primary-foreground focus:bg-primary focus:text-primary-foreground",