diff --git a/resource_booking/__manifest__.py b/resource_booking/__manifest__.py
index 4924ebb1..bf49ba1b 100644
--- a/resource_booking/__manifest__.py
+++ b/resource_booking/__manifest__.py
@@ -25,6 +25,7 @@
         "mail",
         "portal",
         "resource",
+        "web_calendar_slot_duration",
     ],
     "data": [
         "data/mail.xml",
diff --git a/resource_booking/models/resource_booking_type.py b/resource_booking/models/resource_booking_type.py
index 8be41bc1..b026c4b1 100644
--- a/resource_booking/models/resource_booking_type.py
+++ b/resource_booking/models/resource_booking_type.py
@@ -138,7 +138,7 @@ def action_open_bookings(self):
                 default_type_id=self.id,
                 # Context used by web_calendar_slot_duration module
                 calendar_slot_duration=FloatTimeParser.value_to_html(
-                    self.duration, False
+                    self.slot_duration, False
                 ),
             ),
             "domain": [("type_id", "=", self.id)],