diff --git a/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.ml b/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.ml
index cffe8a79..5894f8b7 100644
--- a/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.ml
+++ b/src/client-cohttp-lwt/opentelemetry_client_cohttp_lwt.ml
@@ -567,7 +567,6 @@ let create_backend ?(stop = Atomic.make false) ?(config = Config.make ()) () =
 
 let setup_ ?stop ?config () =
   let backend = create_backend ?stop ?config () in
-  let (module B : OT.Collector.BACKEND) = backend in
   OT.Collector.set_backend backend;
   OT.Collector.remove_backend
 
diff --git a/src/client-ocurl/opentelemetry_client_ocurl.ml b/src/client-ocurl/opentelemetry_client_ocurl.ml
index b5412f25..3da89ba6 100644
--- a/src/client-ocurl/opentelemetry_client_ocurl.ml
+++ b/src/client-ocurl/opentelemetry_client_ocurl.ml
@@ -498,7 +498,7 @@ let setup_ticker_thread ~stop ~sleep_ms (module B : Collector.BACKEND) () =
 
 let setup_ ?(stop = Atomic.make false) ?(config : Config.t = Config.make ()) ()
     =
-  let ((module B) as backend) = create_backend ~stop ~config () in
+  let backend = create_backend ~stop ~config () in
   Opentelemetry.Collector.set_backend backend;
 
   Atomic.set Self_trace.enabled config.self_trace;