diff --git a/src/relay/udprelay/sys/unix/freebsd.rs b/src/relay/udprelay/sys/unix/freebsd.rs
index 42c91164..113372da 100644
--- a/src/relay/udprelay/sys/unix/freebsd.rs
+++ b/src/relay/udprelay/sys/unix/freebsd.rs
@@ -124,7 +124,7 @@ pub fn recv_from_with_destination(socket: &UdpSocket, buf: &mut [u8]) -> io::Res
         msg.msg_iovlen = 1;
 
         msg.msg_control = control_buf.as_mut_ptr() as *mut _;
-        msg.msg_controllen = control_buf.len() as libc::socklen_t;
+        msg.msg_controllen = control_buf.len() as libc::size_t;
 
         let fd = socket.as_raw_fd();
         let ret = libc::recvmsg(fd, &mut msg, 0);
diff --git a/src/relay/udprelay/sys/unix/linux.rs b/src/relay/udprelay/sys/unix/linux.rs
index 217a738c..b89bd963 100644
--- a/src/relay/udprelay/sys/unix/linux.rs
+++ b/src/relay/udprelay/sys/unix/linux.rs
@@ -111,7 +111,7 @@ pub fn recv_from_with_destination(socket: &UdpSocket, buf: &mut [u8]) -> io::Res
         msg.msg_iovlen = 1;
 
         msg.msg_control = control_buf.as_mut_ptr() as *mut _;
-        msg.msg_controllen = control_buf.len() as libc::socklen_t;
+        msg.msg_controllen = control_buf.len() as libc::size_t;
 
         let fd = socket.as_raw_fd();
         let ret = libc::recvmsg(fd, &mut msg, 0);