diff --git a/net/socket/send.c b/net/socket/send.c
index 66d1e3af31e..92b152c7757 100644
--- a/net/socket/send.c
+++ b/net/socket/send.c
@@ -110,7 +110,7 @@ ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
   ret = psock->s_sockif->si_send(psock, buf, len, flags);
   if (ret < 0)
     {
-      nerr("ERROR: socket si_send() (or usrsock_sendto()) failed: %d\n",
+      nerr("ERROR: socket si_send() (or usrsock_sendto()) failed: %zd\n",
            ret);
     }