diff --git a/ruby/lib/jam_ruby/models/rsvp_request.rb b/ruby/lib/jam_ruby/models/rsvp_request.rb
index 9f233b973..700cdebca 100644
--- a/ruby/lib/jam_ruby/models/rsvp_request.rb
+++ b/ruby/lib/jam_ruby/models/rsvp_request.rb
@@ -86,6 +86,7 @@ module JamRuby
             rsvp_slot = RsvpSlot.new
             rsvp_slot.is_unstructured_rsvp = true
             rsvp_slot.music_session = music_session
+            rsvp_slot.instrument_id = "other"
             unless rsvp_slot.save
               raise StateError, 'Unable to auto-create RSVP Slot'
             end