diff --git a/index.js b/index.js
index 41139a2..e2998dd 100644
--- a/index.js
+++ b/index.js
@@ -304,7 +304,7 @@ module.exports = class Protomux {
 
     this._infos = new Map();
     this._notify = new Map();
-    this._slave = false;
+    this._slave = slave;
 
     this.stream.on("data", this._ondata.bind(this));
     this.stream.on("end", this._onend.bind(this));