diff --git a/lib/brrer/indexed_db.ml b/lib/brrer/indexed_db.ml
index f717871..6e87ed8 100644
--- a/lib/brrer/indexed_db.ml
+++ b/lib/brrer/indexed_db.ml
@@ -59,7 +59,7 @@ module Request = struct
   let fut t =
     let result_fut, set = Fut.create () in
     let _ = on_success ~f:(fun _ t -> set (Ok (result t))) t in
-    let _ = on_error ~f:(fun _ t -> set (Error (`Jv (error t)))) t in
+    let _ = on_error ~f:(fun _ t -> set (Error (error t))) t in
     result_fut
 end
 
diff --git a/lib/brrer/indexed_db.mli b/lib/brrer/indexed_db.mli
index d5ce06e..910e7ea 100644
--- a/lib/brrer/indexed_db.mli
+++ b/lib/brrer/indexed_db.mli
@@ -48,7 +48,7 @@ module Request : sig
   val result : 'a t -> 'a
   val on_success : f:(Ev.Type.void Ev.t -> 'a t -> unit) -> 'a t -> 'a t
   val on_error : f:(Ev.Type.void Ev.t -> 'a t -> unit) -> 'a t -> 'a t
-  val fut : 'a t -> ('a, [> `Jv of Jv.Error.t ]) Fut.result
+  val fut : 'a t -> 'a Fut.or_error
 end
 
 module type Key = sig