diff --git a/src/client/lwt/dune b/src/client/lwt/dune
index e5e2bdfb..0106cc8e 100644
--- a/src/client/lwt/dune
+++ b/src/client/lwt/dune
@@ -25,3 +25,15 @@
   mtime.clock.os
   lwt.unix)
  (synopsis "Lwt-specific helpers for opentelemetry-client"))
+
+(rule
+ (enabled_if
+  (>= %{version:lwt} 6.0))
+ (action
+  (copy types_.ml.6 types_.ml)))
+
+(rule
+ (enabled_if
+  (< %{version:lwt} 6.0))
+ (action
+  (copy types_.ml.5 types_.ml)))
diff --git a/src/client/lwt/notifier_lwt.ml b/src/client/lwt/notifier_lwt.ml
index 722ea3d1..c9a241aa 100644
--- a/src/client/lwt/notifier_lwt.ml
+++ b/src/client/lwt/notifier_lwt.ml
@@ -5,7 +5,7 @@ module IO = Io_lwt
 type t = {
   notified: bool Atomic.t;
   cond: unit Lwt_condition.t;
-  notification: Lwt_unix.notification;
+  notification: Types_.notification;
   lwt_tid: int;  (** thread ID where lwt runs *)
   deleted: bool Atomic.t;
 }
diff --git a/src/client/lwt/types_.ml.5 b/src/client/lwt/types_.ml.5
new file mode 100644
index 00000000..c34ffc81
--- /dev/null
+++ b/src/client/lwt/types_.ml.5
@@ -0,0 +1,2 @@
+
+type notification = int
diff --git a/src/client/lwt/types_.ml.6 b/src/client/lwt/types_.ml.6
new file mode 100644
index 00000000..bff82f73
--- /dev/null
+++ b/src/client/lwt/types_.ml.6
@@ -0,0 +1,2 @@
+
+type notification = Lwt_unix.notification