diff --git a/netplay.c b/netplay.c
index d6de891f73..effa6ea38b 100644
--- a/netplay.c
+++ b/netplay.c
@@ -165,7 +165,7 @@ static bool send_chunk(netplay_t *netplay)
    {
       if (sendto(netplay->udp_fd, (const char*)netplay->packet_buffer,
                sizeof(netplay->packet_buffer), 0, addr,
-               sizeof(struct sockaddr)) != sizeof(netplay->packet_buffer))
+               sizeof(struct sockaddr_in6)) != sizeof(netplay->packet_buffer))
       {
          warn_hangup();
          netplay->has_connection = false;