diff --git a/lib/picos_structured/bundle.ml b/lib/picos_structured/bundle.ml
index 2c6f2378..ae8b72ac 100644
--- a/lib/picos_structured/bundle.ml
+++ b/lib/picos_structured/bundle.ml
@@ -1,5 +1,7 @@
 open Picos
 
+let[@inline never] completed () = invalid_arg "already completed"
+
 type t = {
   num_fibers : int Atomic.t;
   bundle : unit Computation.t;
@@ -63,8 +65,6 @@ let join_after fn =
       await t fiber packed canceler;
       Exn_bt.raise exn_bt
 
-let[@inline never] completed () = invalid_arg "already completed"
-
 let rec incr t backoff =
   let before = Atomic.get t.num_fibers in
   if before = 0 then completed ()