diff --git a/src/libnative/io/net.rs b/src/libnative/io/net.rs
index ba951cdef26b9..b7c36a36a5ec0 100644
--- a/src/libnative/io/net.rs
+++ b/src/libnative/io/net.rs
@@ -86,6 +86,7 @@ fn addr_to_sockaddr(addr: rtio::SocketAddr,
                 (*storage).sin6_family = libc::AF_INET6 as libc::sa_family_t;
                 (*storage).sin6_port = htons(addr.port);
                 (*storage).sin6_addr = inaddr;
+                (*storage).sin6_flowinfo = 0;
                 mem::size_of::<libc::sockaddr_in6>()
             }
         };
diff --git a/src/librustuv/net.rs b/src/librustuv/net.rs
index 09d008a9fa904..6fed5416b3032 100644
--- a/src/librustuv/net.rs
+++ b/src/librustuv/net.rs
@@ -98,6 +98,7 @@ fn addr_to_sockaddr(addr: rtio::SocketAddr,
                 let storage = storage as *mut _ as *mut libc::sockaddr_in6;
                 (*storage).sin6_family = libc::AF_INET6 as libc::sa_family_t;
                 (*storage).sin6_port = htons(addr.port);
+                (*storage).sin6_flowinfo = 0;
                 (*storage).sin6_addr = libc::in6_addr {
                     s6_addr: [
                         htons(a),