diff --git a/libp2p-tcp-transport/src/lib.rs b/libp2p-tcp-transport/src/lib.rs
index 4846de33..33e8870f 100644
--- a/libp2p-tcp-transport/src/lib.rs
+++ b/libp2p-tcp-transport/src/lib.rs
@@ -108,6 +108,8 @@ mod tests {
     fn multiaddr_to_tcp_conversion() {
         use std::net::Ipv6Addr;
 
+        assert!(multiaddr_to_socketaddr(&Multiaddr::new("/ip4/127.0.0.1/udp/1234").unwrap()).is_err());
+
         assert_eq!(
             multiaddr_to_socketaddr(&Multiaddr::new("/ip4/127.0.0.1/tcp/12345").unwrap()),
             Ok(SocketAddr::new(
diff --git a/multistream-select/src/error.rs b/multistream-select/src/error.rs
index 12a93eb8..84a26e09 100644
--- a/multistream-select/src/error.rs
+++ b/multistream-select/src/error.rs
@@ -23,7 +23,7 @@
 use protocol::MultistreamSelectError;
 use std::io::Error as IoError;
 
-/// Error that can happen when negociating a protocol with the remote.
+/// Error that can happen when negotiating a protocol with the remote.
 #[derive(Debug)]
 pub enum ProtocolChoiceError {
 	/// Error in the protocol.