diff --git a/include/uv.h b/include/uv.h
index ad328564..4446fd65 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -82,6 +82,7 @@ typedef enum {
   UV_ENOTSOCK,
   UV_ENOTSUP,
   UV_ENOENT,
+  UV_ENOSYS,
   UV_EPIPE,
   UV_EPROTO,
   UV_EPROTONOSUPPORT,
diff --git a/src/unix/error.c b/src/unix/error.c
index 5ce2156e..d5dc0e5c 100644
--- a/src/unix/error.c
+++ b/src/unix/error.c
@@ -58,6 +58,7 @@ void uv_fatal_error(const int errorno, const char* syscall) {
 
 static int uv__translate_lib_error(int code) {
   switch (code) {
+    case UV_ENOSYS: return ENOSYS;
     case UV_ENOENT: return ENOENT;
     case UV_EACCESS: return EACCES;
     case UV_EBADF: return EBADF;
@@ -84,6 +85,7 @@ static int uv__translate_lib_error(int code) {
 uv_err_code uv_translate_sys_error(int sys_errno) {
   switch (sys_errno) {
     case 0: return UV_OK;
+    case ENOSYS: return UV_ENOSYS;
     case ENOENT: return UV_ENOENT;
     case EACCES: return UV_EACCESS;
     case EBADF: return UV_EBADF;
diff --git a/src/uv-common.c b/src/uv-common.c
index b97aac3b..79369f3a 100644
--- a/src/uv-common.c
+++ b/src/uv-common.c
@@ -82,6 +82,7 @@ const char* uv_err_name(uv_err_t err) {
     case UV_ENOTSOCK: return "ENOTSOCK";
     case UV_ENOTSUP: return "ENOTSUP";
     case UV_ENOENT: return "ENOENT";
+    case UV_ENOSYS: return "ENOSYS";
     case UV_EPIPE: return "EPIPE";
     case UV_EPROTO: return "EPROTO";
     case UV_EPROTONOSUPPORT: return "EPROTONOSUPPORT";