diff --git a/lib/tls.js b/lib/tls.js
index 11bf0c53f0f4d1..a1813fc87c7de1 100644
--- a/lib/tls.js
+++ b/lib/tls.js
@@ -29,7 +29,7 @@ exports.getCiphers = internalUtil.cachedResult(() => {
 // Convert protocols array into valid OpenSSL protocols list
 // ("\x06spdy/2\x08http/1.1\x08http/1.0")
 function convertProtocols(protocols) {
-  const lens = Array(protocols.length);
+  const lens = new Array(protocols.length);
   const buff = Buffer.allocUnsafe(protocols.reduce((p, c, i) => {
     var len = Buffer.byteLength(c);
     lens[i] = len;