diff --git a/include/zephyr/mgmt/mcumgr/transport/smp_dummy.h b/include/zephyr/mgmt/mcumgr/transport/smp_dummy.h
index b0c762fa5eb..02e974ea8aa 100644
--- a/include/zephyr/mgmt/mcumgr/transport/smp_dummy.h
+++ b/include/zephyr/mgmt/mcumgr/transport/smp_dummy.h
@@ -98,4 +98,8 @@ void smp_dummy_disable(void);
  */
 bool smp_dummy_get_status(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ZEPHYR_INCLUDE_MGMT_MCUMGR_TRANSPORT_DUMMY_H_ */