diff --git a/include/dbus.h b/include/dbus.h
index 83a05907..19a138a3 100644
--- a/include/dbus.h
+++ b/include/dbus.h
@@ -43,6 +43,7 @@ extern "C" {
 #define OFONO_MESSAGE_MANAGER_INTERFACE "org.ofono.MessageManager"
 #define OFONO_MESSAGE_INTERFACE "org.ofono.Message"
 #define OFONO_MESSAGE_WAITING_INTERFACE "org.ofono.MessageWaiting"
+#define OFONO_SUPPLEMENTARY_SERVICES_INTERFACE "org.ofono.SupplementaryServices"
 #define OFONO_NETWORK_REGISTRATION_INTERFACE "org.ofono.NetworkRegistration"
 #define OFONO_NETWORK_OPERATOR_INTERFACE "org.ofono.NetworkOperator"
 #define OFONO_PHONEBOOK_INTERFACE "org.ofono.Phonebook"