diff --git a/lib/transports/websocket.js b/lib/transports/websocket.js
index 1c7ea92ad..39a6c9fef 100644
--- a/lib/transports/websocket.js
+++ b/lib/transports/websocket.js
@@ -67,7 +67,12 @@ class WS extends Transport {
           "ca",
           "ciphers",
           "rejectUnauthorized",
-          "localAddress"
+          "localAddress",
+          "protocolVersion",
+          "origin",
+          "maxPayload",
+          "family",
+          "checkServerIdentity"
         );
 
     if (this.opts.extraHeaders) {
diff --git a/lib/util.js b/lib/util.js
index fc30f0828..61c00b560 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -1,6 +1,8 @@
 module.exports.pick = (obj, ...attr) => {
   return attr.reduce((acc, k) => {
-    acc[k] = obj[k];
+    if (obj.hasOwnProperty(k)) {
+      acc[k] = obj[k];
+    }
     return acc;
   }, {});
 };