diff --git a/src/platform/redox/socket.rs b/src/platform/redox/socket.rs
index 5914792e2a..5c60608a5c 100644
--- a/src/platform/redox/socket.rs
+++ b/src/platform/redox/socket.rs
@@ -241,7 +241,7 @@ impl PalSocket for Sys {
             SOCK_STREAM => e(syscall::open("tcp:", flags)) as c_int,
             SOCK_DGRAM => e(syscall::open("udp:", flags)) as c_int,
             _ => {
-                errno = syscall::EPROTOTYPE;
+                errno = syscall::EPROTONOSUPPORT;
                 -1
             }
         }