diff --git a/src/libstd/rt/io/mod.rs b/src/libstd/rt/io/mod.rs
index c2f137ba119..6e622c9572c 100644
--- a/src/libstd/rt/io/mod.rs
+++ b/src/libstd/rt/io/mod.rs
@@ -367,6 +367,7 @@ pub enum IoErrorKind {
     Closed,
     ConnectionRefused,
     ConnectionReset,
+    NotConnected,
     BrokenPipe,
     PathAlreadyExists,
     PathDoesntExist,
@@ -386,6 +387,7 @@ impl ToStr for IoErrorKind {
             Closed => ~"Closed",
             ConnectionRefused => ~"ConnectionRefused",
             ConnectionReset => ~"ConnectionReset",
+            NotConnected => ~"NotConnected",
             BrokenPipe => ~"BrokenPipe",
             PathAlreadyExists => ~"PathAlreadyExists",
             PathDoesntExist => ~"PathDoesntExist",
diff --git a/src/libstd/rt/uv/mod.rs b/src/libstd/rt/uv/mod.rs
index 0c5351ea9e4..67926b35a62 100644
--- a/src/libstd/rt/uv/mod.rs
+++ b/src/libstd/rt/uv/mod.rs
@@ -267,6 +267,7 @@ pub fn uv_error_to_io_error(uverr: UvError) -> IoError {
             EACCES => PermissionDenied,
             ECONNREFUSED => ConnectionRefused,
             ECONNRESET => ConnectionReset,
+            ENOTCONN => NotConnected,
             EPIPE => BrokenPipe,
             err => {
                 rtdebug!("uverr.code {}", err as int);
diff --git a/src/libstd/rt/uv/uvll.rs b/src/libstd/rt/uv/uvll.rs
index 790bf53a291..a80d5cbc1fb 100644
--- a/src/libstd/rt/uv/uvll.rs
+++ b/src/libstd/rt/uv/uvll.rs
@@ -53,6 +53,7 @@ pub mod errors {
     pub static EACCES: c_int = -4093;
     pub static ECONNREFUSED: c_int = -4079;
     pub static ECONNRESET: c_int = -4078;
+    pub static ENOTCONN: c_int = -4054;
     pub static EPIPE: c_int = -4048;
 }
 #[cfg(not(windows))]
@@ -63,6 +64,7 @@ pub mod errors {
     pub static EACCES: c_int = -libc::EACCES;
     pub static ECONNREFUSED: c_int = -libc::ECONNREFUSED;
     pub static ECONNRESET: c_int = -libc::ECONNRESET;
+    pub static ENOTCONN: c_int = -libc::ENOTCONN;
     pub static EPIPE: c_int = -libc::EPIPE;
 }