diff --git a/Cargo.toml b/Cargo.toml
index 7258c62c..e2d49fe4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,13 +19,10 @@ all-features = true
 version = "0.3.3"
 features = ["handleapi", "ws2def", "ws2ipdef", "ws2tcpip", "minwindef"]
 
-[target."cfg(any(unix, target_os = \"redox\"))".dependencies]
+[target."cfg(unix)".dependencies]
 cfg-if = "1.0"
 libc = { version = "0.2.66", features = ["align"] }
 
-[target."cfg(target_os = \"redox\")".dependencies]
-redox_syscall = "0.1.38"
-
 [dev-dependencies]
 tempdir = "0.3"
 
diff --git a/src/socket.rs b/src/socket.rs
index b8b48cfd..c69262ca 100644
--- a/src/socket.rs
+++ b/src/socket.rs
@@ -373,7 +373,7 @@ impl Socket {
     ///
     /// The `TCP_MAXSEG` option denotes the TCP Maximum Segment
     /// Size and is only available on TCP sockets.
-    #[cfg(unix)]
+    #[cfg(all(unix, not(target_os = "redox")))]
     pub fn mss(&self) -> io::Result<u32> {
         self.inner.mss()
     }
@@ -382,7 +382,7 @@ impl Socket {
     ///
     /// The `TCP_MAXSEG` option denotes the TCP Maximum Segment
     /// Size and is only available on TCP sockets.
-    #[cfg(unix)]
+    #[cfg(all(unix, not(target_os = "redox")))]
     pub fn set_mss(&self, mss: u32) -> io::Result<()> {
         self.inner.set_mss(mss)
     }
diff --git a/src/sys/unix.rs b/src/sys/unix.rs
index 784187c5..5f3c27c9 100644
--- a/src/sys/unix.rs
+++ b/src/sys/unix.rs
@@ -31,7 +31,9 @@ pub use libc::c_int;
 // Used in `Domain`.
 pub(crate) use libc::{AF_INET, AF_INET6};
 // Used in `Type`.
-pub(crate) use libc::{SOCK_DGRAM, SOCK_RAW, SOCK_SEQPACKET, SOCK_STREAM};
+#[cfg(not(target_os = "redox"))]
+pub(crate) use libc::SOCK_RAW;
+pub(crate) use libc::{SOCK_DGRAM, SOCK_SEQPACKET, SOCK_STREAM};
 // Used in `Protocol`.
 pub(crate) use libc::{IPPROTO_ICMP, IPPROTO_ICMPV6, IPPROTO_TCP, IPPROTO_UDP};
 
@@ -131,8 +133,9 @@ impl_debug!(
     crate::Type,
     libc::SOCK_STREAM,
     libc::SOCK_DGRAM,
+    #[cfg(not(target_os = "redox"))]
     libc::SOCK_RAW,
-    #[cfg(not(target_os = "haiku"))]
+    #[cfg(not(any(target_os = "haiku", target_os = "redox")))]
     libc::SOCK_RDM,
     libc::SOCK_SEQPACKET,
     /* TODO: add these optional bit OR-ed flags:
@@ -534,6 +537,7 @@ impl Socket {
         unsafe { self.setsockopt(libc::IPPROTO_IP, libc::IP_TTL, ttl as c_int) }
     }
 
+    #[cfg(not(target_os = "redox"))]
     pub fn mss(&self) -> io::Result<u32> {
         unsafe {
             let raw: c_int = self.getsockopt(libc::IPPROTO_TCP, libc::TCP_MAXSEG)?;
@@ -541,6 +545,7 @@ impl Socket {
         }
     }
 
+    #[cfg(not(target_os = "redox"))]
     pub fn set_mss(&self, mss: u32) -> io::Result<()> {
         unsafe { self.setsockopt(libc::IPPROTO_TCP, libc::TCP_MAXSEG, mss as c_int) }
     }