--- a/PC_Mainboard/Apps/cards/lib/compass.mli
+++ b/PC_Mainboard/Apps/cards/lib/compass.mli
@@ -7,8 +7,8 @@
  * This file is a part of [kro]bot.
  *)
 
-type compass = OBus_proxy.t
+type t = OBus_proxy.t
 
-val compass : compass Lwt.t Lazy.t
+val compass : t Lwt.t Lazy.t
 
-val get : compass -> int Lwt.t
+val get : t -> int Lwt.t