diff --git a/lib/plat/unix/unix-sockets.c b/lib/plat/unix/unix-sockets.c
index cb2f1bbae..aff0a2af6 100644
--- a/lib/plat/unix/unix-sockets.c
+++ b/lib/plat/unix/unix-sockets.c
@@ -191,21 +191,23 @@ lws_plat_set_socket_options(struct lws_vhost *vhost, int fd, int unix_skt)
 }
 
 static const int ip_opt_lws_flags[] = {
-	LCCSCF_IP_LOW_LATENCY, LCCSCF_IP_HIGH_THROUGHPUT,
-	LCCSCF_IP_HIGH_RELIABILITY
-#if !defined(__OpenBSD__)
+	LCCSCF_IP_LOW_LATENCY, LCCSCF_IP_HIGH_THROUGHPUT
+#if !defined(__OpenBSD__) && !defined(__sun) && !defined(__QNX__)
+	, LCCSCF_IP_HIGH_RELIABILITY
 	, LCCSCF_IP_LOW_COST
 #endif
 }, ip_opt_val[] = {
-	IPTOS_LOWDELAY, IPTOS_THROUGHPUT, IPTOS_RELIABILITY
+	IPTOS_LOWDELAY, IPTOS_THROUGHPUT
 #if !defined(__OpenBSD__) && !defined(__sun) && !defined(__QNX__)
+	, IPTOS_RELIABILITY
 	, IPTOS_MINCOST
 #endif
 };
 #if !defined(LWS_WITH_NO_LOGS)
 static const char *ip_opt_names[] = {
-	"LOWDELAY", "THROUGHPUT", "RELIABILITY"
-#if !defined(__OpenBSD__) && !defined(__sun)
+	"LOWDELAY", "THROUGHPUT"
+#if !defined(__OpenBSD__) && !defined(__sun) && !defined(__QNX__)
+	, "RELIABILITY"
 	, "MINCOST"
 #endif
 };
@@ -255,7 +257,10 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
 	}
 #endif
 
-	for (n = 0; n < 4; n++) {
+
+#if !defined(__NuttX__)
+	/* array size differs by platform */
+	for (n = 0; n < (int)LWS_ARRAY_SIZE(ip_opt_lws_flags); n++) {
 		if (!(lws_flags & ip_opt_lws_flags[n]))
 			continue;
 
@@ -272,6 +277,7 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
 			lwsl_notice("%s: set ip flag %s\n", __func__,
 				    ip_opt_names[n]);
 	}
+#endif
 
 	return ret;
 }