diff --git a/web.rb b/web.rb
index f70fde322f7195375bf4e8b59085125ecf05bc87..18c94e92ef1a3068cdfb51a692f258c11ced20f7 100644
--- a/web.rb
+++ b/web.rb
@@ -211,7 +211,9 @@ class Web < Roda
 				cc.from = from
 				cc.application_id = application_id
 				cc.answer_url = url inbound_calls_path(nil, customer_id)
-				cc.disconnect_url = url inbound_calls_path(:transfer_complete)
+				cc.disconnect_url = url(
+					inbound_calls_path(:transfer_complete, customer_id)
+				)
 			end
 		end
 	end