diff --git a/src/libstd/rt/io/net/ip.rs b/src/libstd/rt/io/net/ip.rs
index d71b891350ec..3a93fd705436 100644
--- a/src/libstd/rt/io/net/ip.rs
+++ b/src/libstd/rt/io/net/ip.rs
@@ -8,8 +8,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+type Port = u16;
+
 #[deriving(Eq, TotalEq)]
 pub enum IpAddr {
-    Ipv4(u8, u8, u8, u8, u16),
-    Ipv6
+    Ipv4(u8, u8, u8, u8, Port),
+    Ipv6(u16, u16, u16, u16, u16, u16, u16, u16, Port)
 }