diff --git a/src/core/sockfd.c b/src/core/sockfd.c
index 1b4dbc1d7..edf8e0c2d 100644
--- a/src/core/sockfd.c
+++ b/src/core/sockfd.c
@@ -137,8 +137,7 @@ sfd_listener_set_fd(void *arg, const void *buf, size_t sz, nni_type t)
 	int           fd;
 	int           rv;
 
-	if ((rv = nni_copyin_int(&fd, buf, sz, NNI_MININT, NNI_MAXINT, t)) !=
-	    0) {
+	if ((rv = nni_copyin_int(&fd, buf, sz, 0, NNI_MAXINT, t)) != 0) {
 		return (rv);
 	}
 
@@ -169,7 +168,7 @@ static int
 sfd_listener_get_addr(void *arg, void *buf, size_t *szp, nni_type t)
 {
 	NNI_ARG_UNUSED(arg);
-	nng_sockaddr      sa;
+	nng_sockaddr sa;
 	sa.s_family = NNG_AF_UNSPEC;
 	return (nni_copyout_sockaddr(&sa, buf, szp, t));
 }
@@ -181,7 +180,7 @@ static const nni_option sfd_listener_options[] = {
 	},
 	{
 	    .o_name = NNG_OPT_LOCADDR,
-	    .o_get = sfd_listener_get_addr,
+	    .o_get  = sfd_listener_get_addr,
 	},
 	{
 	    .o_name = NULL,
diff --git a/src/sp/transport/socket/sockfd_test.c b/src/sp/transport/socket/sockfd_test.c
index c27f49bdf..de1f582b0 100644
--- a/src/sp/transport/socket/sockfd_test.c
+++ b/src/sp/transport/socket/sockfd_test.c
@@ -484,6 +484,22 @@ test_sfd_fd_option_type(void)
 #endif
 }
 
+void
+test_sfd_fd_invalid_fd(void)
+{
+#ifdef NNG_HAVE_SOCKETPAIR
+	nng_socket   s;
+	nng_listener l;
+
+	NUTS_OPEN(s);
+	NUTS_PASS(nng_listener_create(&l, s, "socket://"));
+	NUTS_FAIL(
+	    nng_listener_set_int(l, NNG_OPT_SOCKET_FD, -100), NNG_EINVAL);
+	NUTS_CLOSE(s);
+#else
+	NUTS_SKIP("no socketpair");
+#endif
+}
 void
 test_sfd_fd_dev_zero(void)
 {
@@ -521,6 +537,7 @@ NUTS_TESTS = {
 	{ "socket pipe peer id", test_sockfd_pipe_peer },
 	{ "socket listen full", test_sfd_listen_full },
 	{ "socket bad fd type", test_sfd_fd_option_type },
+	{ "socket invalid fd", test_sfd_fd_invalid_fd },
 	{ "socket dev zero", test_sfd_fd_dev_zero },
 	{ NULL, NULL },
 };