diff --git a/index.js b/index.js
index e9c3022..4313d42 100644
--- a/index.js
+++ b/index.js
@@ -262,7 +262,7 @@ class Channel {
 }
 
 module.exports = class Protomux {
-  constructor(stream, { alloc } = {}) {
+  constructor(stream, { alloc, slave = false } = {}) {
     if (stream.userData === null) stream.userData = this;
 
     this.isProtomux = true;
@@ -287,6 +287,7 @@ module.exports = class Protomux {
 
     this._infos = new Map();
     this._notify = new Map();
+    this._slave = false;
 
     this.stream.on("data", this._ondata.bind(this));
     this.stream.on("end", this._onend.bind(this));
@@ -574,7 +575,7 @@ module.exports = class Protomux {
     }
   }
 
-  _onopensession(state) {
+  async _onopensession(state) {
     const remoteId = c.uint.decode(state);
     const protocol = c.string.decode(state);
     const id = c.buffer.decode(state);
@@ -589,6 +590,10 @@ module.exports = class Protomux {
     const rid = remoteId - 1;
     const info = this._get(protocol, id);
 
+    if (this._slave) {
+      await this._mux.syncState?.();
+    }
+
     // allow the remote to grow the ids by one
     if (this._remote.length === rid) {
       this._remote.push(null);