diff --git a/pos_restaurant_table_booking/models/restaurant_booking.py b/pos_restaurant_table_booking/models/restaurant_booking.py
index 4b4efa5..04ef2eb 100644
--- a/pos_restaurant_table_booking/models/restaurant_booking.py
+++ b/pos_restaurant_table_booking/models/restaurant_booking.py
@@ -55,9 +55,9 @@ class RestaurantBooking(models.Model):
         string="Tables bookings", readonly=True)
 
     _sql_constraints = [
-        ('start_time_check', 'CHECK(time_start >= 0 AND time_start <= 24)', "The start time must be between 0 and 24.")
-        ('stop_time_check', 'CHECK(time_stop >= 0 AND time_stop <= 24)', "The stop time must be between 0 and 24.")
-        ('times_order_check', 'CHECK(time_start < time_stop)', "The start time must be lower than the stop time.")
+        ('start_time_check', 'CHECK(time_start >= 0 AND time_start <= 24)', "The start time must be between 0 and 24."),
+        ('stop_time_check', 'CHECK(time_stop >= 0 AND time_stop <= 24)', "The stop time must be between 0 and 24."),
+        ('times_order_check', 'CHECK(time_start < time_stop)', "The start time must be lower than the stop time."),
     ]
 
     @api.depends('time_start', 'duration')