diff --git a/src/io_posix.c b/src/io_posix.c
index bdf6d78..048a2a1 100644
--- a/src/io_posix.c
+++ b/src/io_posix.c
@@ -127,13 +127,13 @@ udx__recvmsg (udx_socket_t *handle, uv_buf_t *buf, struct sockaddr *addr, int ad
 
 #if defined(__linux__)
 int
-udx__udp_set_rxq_ovfl (int fd) {
+udx__udp_set_rxq_ovfl (uv_os_sock_t fd) {
   int on = 1;
   return setsockopt(fd, SOL_SOCKET, SO_RXQ_OVFL, &on, sizeof(on));
 }
 #else
 int
-udx__udp_set_rxq_ovfl (int fd) {
+udx__udp_set_rxq_ovfl (uv_os_sock_t fd) {
   UDX_UNUSED(fd);
   return -1;
 }
diff --git a/src/io_win.c b/src/io_win.c
index d7a2df6..630f76e 100644
--- a/src/io_win.c
+++ b/src/io_win.c
@@ -83,7 +83,7 @@ udx__recvmsg (udx_socket_t *socket, uv_buf_t *buf, struct sockaddr *addr, int ad
 }
 
 int
-udx__udp_set_rxq_ovfl (int fd) {
+udx__udp_set_rxq_ovfl (uv_os_sock_t fd) {
   UDX_UNUSED(fd);
   return -1;
 }
diff --git a/src/udx.c b/src/udx.c
index 6ea7309..08538f7 100644
--- a/src/udx.c
+++ b/src/udx.c
@@ -2085,7 +2085,7 @@ udx_socket_bind (udx_socket_t *socket, const struct sockaddr *addr, unsigned int
   err = uv_poll_init_socket(socket->udx->loop, poll, (uv_os_sock_t) fd);
   assert(err == 0);
 
-  err = udx__udp_set_rxq_ovfl(fd);
+  err = udx__udp_set_rxq_ovfl((uv_os_sock_t) fd);
   if (!err) {
     socket->cmsg_wanted = true;
     socket->packets_dropped_by_kernel = 0;