diff --git a/addons/base_calendar/base_calendar.py b/addons/base_calendar/base_calendar.py
index 94f2499e207..da9b232d82d 100644
--- a/addons/base_calendar/base_calendar.py
+++ b/addons/base_calendar/base_calendar.py
@@ -1150,7 +1150,7 @@ e.g.: Every other month on the last Sunday of the month for 10 occurrences:\
                                 ('weekly', 'Weeks'), \
                                 ('monthly', 'Months'), \
                                 ('yearly', 'Years'), ], 'Frequency'),
-        'interval': fields.integer('Interval', help="Repeat every (Days/Week/month/year)"),
+        'interval': fields.integer('Interval', help="Repeat every (Days/Week/Month/Year)"),
         'count': fields.integer('Count', help="Repeat max that times"),
         'mo': fields.boolean('Mon'),
         'tu': fields.boolean('Tue'),