diff --git a/src/client/bounded_queue_sync.ml b/src/client/bounded_queue_sync.ml
index d47dff99..55207d64 100644
--- a/src/client/bounded_queue_sync.ml
+++ b/src/client/bounded_queue_sync.ml
@@ -28,7 +28,7 @@ module Q : sig
       number of items that could not be pushed, and [old_size] is the size
       before anything was pushed. *)
 end = struct
-  module UM = Opentelemetry_util.Util_mutex
+  module UM = Util_mutex
 
   type 'a t = {
     mutex: Mutex.t;
diff --git a/src/client/dune b/src/client/dune
index c1c61af4..4f8d8258 100644
--- a/src/client/dune
+++ b/src/client/dune
@@ -9,6 +9,7 @@
   opentelemetry.proto
   opentelemetry.domain
   pbrt
+  threads.posix
   mtime
   mtime.clock.os)
  (synopsis
diff --git a/src/client/sync_queue.ml b/src/client/sync_queue.ml
index 46d46af1..25d83588 100644
--- a/src/client/sync_queue.ml
+++ b/src/client/sync_queue.ml
@@ -1,4 +1,4 @@
-module UM = Opentelemetry_util.Util_mutex
+module UM = Util_mutex
 
 type 'a t = {
   mutex: Mutex.t;
diff --git a/src/util/util_mutex.ml b/src/client/util_mutex.ml
similarity index 100%
rename from src/util/util_mutex.ml
rename to src/client/util_mutex.ml
diff --git a/src/util/util_mutex.mli b/src/client/util_mutex.mli
similarity index 100%
rename from src/util/util_mutex.mli
rename to src/client/util_mutex.mli