diff --git a/src/client/exporter_stdout.ml b/src/client/exporter_stdout.ml
index f4d333d6..0613c07b 100644
--- a/src/client/exporter_stdout.ml
+++ b/src/client/exporter_stdout.ml
@@ -1,7 +1,6 @@
 (** A simple exporter that prints on stdout *)
 
 open Common_
-open Opentelemetry_util
 open Opentelemetry_emitter
 
 open struct
diff --git a/src/core/span.mli b/src/core/span.mli
index 8d5da0e5..0cd9478b 100644
--- a/src/core/span.mli
+++ b/src/core/span.mli
@@ -22,6 +22,8 @@ type kind = Span_kind.t =
 
 type key_value = Key_value.t
 
+val pp : Format.formatter -> t -> unit
+
 val make :
   ?kind:kind ->
   ?trace_state:string ->