diff --git a/openstack/networking/v2/subnets/requests.go b/openstack/networking/v2/subnets/requests.go
index 2368bf5..6cde048 100644
--- a/openstack/networking/v2/subnets/requests.go
+++ b/openstack/networking/v2/subnets/requests.go
@@ -202,10 +202,10 @@
 	if opts.GatewayIP != "" {
 		s["gateway_ip"] = opts.GatewayIP
 	}
-	if len(opts.DNSNameservers) != 0 {
+	if opts.DNSNameservers != nil {
 		s["dns_nameservers"] = opts.DNSNameservers
 	}
-	if len(opts.HostRoutes) != 0 {
+	if opts.HostRoutes != nil {
 		s["host_routes"] = opts.HostRoutes
 	}