diff --git a/lib/internal/net.js b/lib/internal/net.js
index 8f279cad1608f5..ce8f549bdfa613 100644
--- a/lib/internal/net.js
+++ b/lib/internal/net.js
@@ -9,13 +9,6 @@ function isLegalPort(port) {
   return +port === (+port >>> 0) && port <= 0xFFFF;
 }
 
-
-function assertPort(port) {
-  if (typeof port !== 'undefined' && !isLegalPort(port))
-    throw new RangeError('"port" argument must be >= 0 and < 65536');
-}
-
 module.exports = {
-  isLegalPort,
-  assertPort
+  isLegalPort
 };