diff --git a/gui.lua b/gui.lua
index 4441a0b..acb4b51 100644
--- a/gui.lua
+++ b/gui.lua
@@ -7,6 +7,7 @@ end
 local F = minetest.formspec_escape
 
 local COLOR_HOLIDAY = "#00FF00"
+local COLOR_DAYBOX_HOLIDAY = "#00200080"
 local COLOR_DAYBOX = "#00000080"
 local COLOR_DAYBOX_TODAY = "#FFFFFF80"
 
@@ -83,6 +84,7 @@ function calendar.show_calendar(player_name, settings, wanted_months, wanted_yea
 		if #holidays > 0 then
 			table.insert(tooltip_lines, minetest.colorize(COLOR_HOLIDAY, holidays[1].name))
 			day_str = minetest.colorize(COLOR_HOLIDAY, day_str)
+			box_color = COLOR_DAYBOX_HOLIDAY
 		end
 		if tdays == total_days then
 			box_color = COLOR_DAYBOX_TODAY