diff --git a/lib/core-net/private-lib-core-net.h b/lib/core-net/private-lib-core-net.h
index eacdeed28..6b122568c 100644
--- a/lib/core-net/private-lib-core-net.h
+++ b/lib/core-net/private-lib-core-net.h
@@ -1508,9 +1508,11 @@ lws_sul_nonmonotonic_adjust(struct lws_context *ctx, int64_t step_us);
 void
 lws_netdev_instance_remove_destroy(struct lws_netdev_instance *ni);
 
+#if defined(LWS_WITH_SYS_SMD)
 int
 lws_netdev_smd_cb(void *opaque, lws_smd_class_t _class, lws_usec_t timestamp,
 		  void *buf, size_t len);
+#endif
 
 void
 lws_netdev_instance_create(lws_netdev_instance_t *ni, struct lws_context *ctx,
diff --git a/lib/secure-streams/secure-streams.c b/lib/secure-streams/secure-streams.c
index 597730f0e..edb0f6900 100644
--- a/lib/secure-streams/secure-streams.c
+++ b/lib/secure-streams/secure-streams.c
@@ -819,10 +819,12 @@ lws_ss_destroy(lws_ss_handle_t **ppss)
 	 * if we bound an smd registration to the SS, unregister it
 	 */
 
+#if defined(LWS_WITH_SYS_SMD)
 	if (h->policy == &pol_smd && h->u.smd.smd_peer) {
 		lws_smd_unregister(h->u.smd.smd_peer);
 		h->u.smd.smd_peer = NULL;
 	}
+#endif
 
 	pt = &h->context->pt[h->tsi];
 
diff --git a/minimal-examples/secure-streams/minimal-secure-streams-server-raw/CMakeLists.txt b/minimal-examples/secure-streams/minimal-secure-streams-server-raw/CMakeLists.txt
index c6debce03..c4fbe0d2b 100644
--- a/minimal-examples/secure-streams/minimal-secure-streams-server-raw/CMakeLists.txt
+++ b/minimal-examples/secure-streams/minimal-secure-streams-server-raw/CMakeLists.txt
@@ -11,6 +11,7 @@ set(SRCS main.c ss-server.c)
 set(requirements 1)
 require_lws_config(LWS_ROLE_H1 1 requirements)
 require_lws_config(LWS_WITH_SERVER 1 requirements)
+require_lws_config(LWS_WITH_SYS_SMD 1 requirements)
 require_lws_config(LWS_WITH_SECURE_STREAMS 1 requirements)
 require_lws_config(LWS_WITH_SECURE_STREAMS_STATIC_POLICY_ONLY 0 requirements)
 
diff --git a/minimal-examples/secure-streams/minimal-secure-streams-server/CMakeLists.txt b/minimal-examples/secure-streams/minimal-secure-streams-server/CMakeLists.txt
index a2170a6d4..862a041c5 100644
--- a/minimal-examples/secure-streams/minimal-secure-streams-server/CMakeLists.txt
+++ b/minimal-examples/secure-streams/minimal-secure-streams-server/CMakeLists.txt
@@ -12,6 +12,7 @@ set(requirements 1)
 require_lws_config(LWS_ROLE_H1 1 requirements)
 require_lws_config(LWS_WITH_CLIENT 1 requirements)
 require_lws_config(LWS_WITH_SERVER 1 requirements)
+require_lws_config(LWS_WITH_SYS_SMD 1 requirements)
 require_lws_config(LWS_WITH_SECURE_STREAMS 1 requirements)
 require_lws_config(LWS_WITH_SECURE_STREAMS_STATIC_POLICY_ONLY 0 requirements)