diff --git a/src/tcp/listener.rs b/src/tcp/listener.rs
index 73404ae6..cf222169 100644
--- a/src/tcp/listener.rs
+++ b/src/tcp/listener.rs
@@ -1,5 +1,6 @@
 use super::TcpStream;
 
+use std::convert::TryFrom;
 use std::fmt;
 use std::io;
 use std::net::{self, SocketAddr};
@@ -243,6 +244,14 @@ mod sys {
     }
 }
 
+impl TryFrom<std::net::TcpListener> for TcpListener {
+    type Error = io::Error;
+
+    fn try_from(socket: std::net::TcpListener) -> Result<Self, Self::Error> {
+        mio::net::TcpListener::from_std(socket).map(TcpListener::new)
+    }
+}
+
 /// Stream returned by the `TcpListener::incoming` function representing the
 /// stream of sockets received from a listener.
 #[must_use = "streams do nothing unless polled"]
diff --git a/src/udp.rs b/src/udp.rs
index 6fd428f6..6c892552 100644
--- a/src/udp.rs
+++ b/src/udp.rs
@@ -11,6 +11,7 @@
 //! [received from]: #method.poll_recv_from
 //! [sent to]: #method.poll_send_to
 
+use std::convert::TryFrom;
 use std::fmt;
 use std::io;
 use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr};
@@ -402,6 +403,14 @@ mod sys {
     }
 }
 
+impl TryFrom<std::net::UdpSocket> for UdpSocket {
+    type Error = io::Error;
+
+    fn try_from(socket: std::net::UdpSocket) -> Result<Self, Self::Error> {
+        mio::net::UdpSocket::from_socket(socket).map(UdpSocket::new)
+    }
+}
+
 /// The future returned by `UdpSocket::send_to`
 #[derive(Debug)]
 pub struct SendTo<'a, 'b> {
diff --git a/src/uds/ucred.rs b/src/uds/ucred.rs
index de127b17..b17ef41e 100644
--- a/src/uds/ucred.rs
+++ b/src/uds/ucred.rs
@@ -86,12 +86,14 @@ pub(crate) mod impl_macos {
         unsafe {
             let raw_fd = sock.as_raw_fd();
 
-            let mut cred: super::UCred = mem::uninitialized();
-
-            let ret = getpeereid(raw_fd, &mut cred.uid, &mut cred.gid);
+            let mut cred = mem::MaybeUninit::<super::UCred>::uninit();
+            let ret = {
+                let cred_mut = cred.as_mut_ptr();
+                getpeereid(raw_fd, &mut (*cred_mut).uid, &mut (*cred_mut).gid)
+            };
 
             if ret == 0 {
-                Ok(cred)
+                Ok(cred.assume_init())
             } else {
                 Err(io::Error::last_os_error())
             }
diff --git a/tests/tcp.rs b/tests/tcp.rs
index fc5ff6c4..5fb6dc0a 100644
--- a/tests/tcp.rs
+++ b/tests/tcp.rs
@@ -1,6 +1,7 @@
 #![feature(async_await)]
+use std::convert::TryFrom;
 use std::io::{Read, Write};
-use std::net::TcpStream;
+use std::net::{SocketAddr, TcpStream};
 use std::thread;
 
 use futures::executor;
@@ -79,3 +80,11 @@ fn both_sides_async_using_threadpool() {
         assert_eq!(buf, THE_WINTERS_TALE);
     }));
 }
+
+#[test]
+fn listener_from_std() {
+    drop(env_logger::try_init());
+    let addr: SocketAddr = "127.0.0.1:0".parse().unwrap();
+    let std_socket = std::net::TcpListener::bind(&addr).unwrap();
+    let _ = TcpListener::try_from(std_socket).unwrap();
+}
diff --git a/tests/udp.rs b/tests/udp.rs
new file mode 100644
index 00000000..916cb43a
--- /dev/null
+++ b/tests/udp.rs
@@ -0,0 +1,38 @@
+#![feature(async_await)]
+use std::convert::TryFrom;
+use std::net::SocketAddr;
+use futures::executor;
+use romio::UdpSocket;
+
+const THE_WINTERS_TALE: &[u8] = b"
+                    Each your doing,
+    So singular in each particular,
+    Crowns what you are doing in the present deed,
+    That all your acts are queens.
+";
+
+async fn exchange(mut socket: UdpSocket) {
+	let addr = socket.local_addr().unwrap();
+	let mut buf = vec![0; THE_WINTERS_TALE.len()];
+
+	socket.send_to(THE_WINTERS_TALE, &addr).await.unwrap();
+	let (n, sender) = socket.recv_from(&mut buf).await.unwrap();
+	assert_eq!(sender, addr);
+	assert_eq!(&buf[..n], THE_WINTERS_TALE);
+}
+
+#[test]
+fn socket_sends_and_receives() {
+    drop(env_logger::try_init());
+    let socket = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap()).unwrap();
+    executor::block_on(exchange(socket));
+}
+
+#[test]
+fn socket_from_std() {
+    drop(env_logger::try_init());
+    let addr: SocketAddr = "127.0.0.1:0".parse().unwrap();
+    let std_socket = std::net::UdpSocket::bind(&addr).unwrap();
+    let socket = UdpSocket::try_from(std_socket).unwrap();
+    executor::block_on(exchange(socket));
+}
\ No newline at end of file