diff --git a/lib/net_uv.js b/lib/net_uv.js
index 37888eda289..4c38e0c56c7 100644
--- a/lib/net_uv.js
+++ b/lib/net_uv.js
@@ -565,10 +565,10 @@ exports.isIP = function(input) {
 
 
 exports.isIPv4 = function(input) {
-  return TCP.isIP(input) === 4;
+  return exports.isIP(input) === 4;
 };
 
 
 exports.isIPv6 = function(input) {
-  return TCP.isIP(input) === 6;
+  return exports.isIP(input) === 6;
 };