diff --git a/lib/src/client.dart b/lib/src/client.dart
index a3637dd..7aa0479 100644
--- a/lib/src/client.dart
+++ b/lib/src/client.dart
@@ -113,8 +113,8 @@ class Client {
   ///
   /// Throws a [StateError] if the client is closed while the request is in
   /// flight, or if the client is closed when this method is called.
-  Future sendRequest(String method, [Object? parameters]) {
-    var id = _id++;
+  Future sendRequest(String method, [Object? parameters, int? id]) {
+    id ??= _id++;
     _send(method, parameters, id);
 
     var completer = Completer.sync();
diff --git a/lib/src/peer.dart b/lib/src/peer.dart
index 002af31..9774ff4 100644
--- a/lib/src/peer.dart
+++ b/lib/src/peer.dart
@@ -94,8 +94,8 @@ class Peer implements Client, Server {
   // Client methods.
 
   @override
-  Future sendRequest(String method, [Object? parameters]) =>
-      _client.sendRequest(method, parameters);
+  Future sendRequest(String method, [Object? parameters, int? id]) =>
+      _client.sendRequest(method, parameters, id);
 
   @override
   void sendNotification(String method, [Object? parameters]) =>