diff --git a/mms-lib/src/mms_connection.c b/mms-lib/src/mms_connection.c
index 09dded1..174cbd5 100644
--- a/mms-lib/src/mms_connection.c
+++ b/mms-lib/src/mms_connection.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2015 Jolla Ltd.
+ * Copyright (C) 2013-2016 Jolla Ltd.
  * Contact: Slava Monich <slava.monich@jolla.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,7 +19,7 @@
 #define MMS_LOG_MODULE_NAME mms_connection_log
 #include "mms_lib_log.h"
 
-G_DEFINE_TYPE(MMSConnection, mms_connection, G_TYPE_OBJECT);
+G_DEFINE_ABSTRACT_TYPE(MMSConnection, mms_connection, G_TYPE_OBJECT)
 #define MMS_CONNECTION_GET_CLASS(obj)  \
     (G_TYPE_INSTANCE_GET_CLASS((obj), MMS_TYPE_CONNECTION, MMSConnectionClass))
 
diff --git a/mms-lib/src/mms_connman.c b/mms-lib/src/mms_connman.c
index a7b4f07..5b93160 100644
--- a/mms-lib/src/mms_connman.c
+++ b/mms-lib/src/mms_connman.c
@@ -19,7 +19,7 @@
 #define MMS_LOG_MODULE_NAME mms_connman_log
 #include "mms_lib_log.h"
 
-G_DEFINE_TYPE(MMSConnMan, mms_connman, G_TYPE_OBJECT);
+G_DEFINE_ABSTRACT_TYPE(MMSConnMan, mms_connman, G_TYPE_OBJECT)
 #define MMS_CONNMAN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),\
     MMS_TYPE_CONNMAN, MMSConnMan))
 #define MMS_CONNMAN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), \
diff --git a/mms-lib/src/mms_handler.c b/mms-lib/src/mms_handler.c
index f5d6583..f7c26e1 100644
--- a/mms-lib/src/mms_handler.c
+++ b/mms-lib/src/mms_handler.c
@@ -19,7 +19,7 @@
 #define MMS_LOG_MODULE_NAME mms_handler_log
 #include "mms_lib_log.h"
 
-G_DEFINE_TYPE(MMSHandler, mms_handler, G_TYPE_OBJECT);
+G_DEFINE_ABSTRACT_TYPE(MMSHandler, mms_handler, G_TYPE_OBJECT)
 
 #define MMS_HANDLER(obj) \
     (G_TYPE_CHECK_INSTANCE_CAST((obj), MMS_TYPE_HANDLER, MMSHandler))
diff --git a/mms-lib/src/mms_task.c b/mms-lib/src/mms_task.c
index 25735dd..e526da2 100644
--- a/mms-lib/src/mms_task.c
+++ b/mms-lib/src/mms_task.c
@@ -33,7 +33,7 @@ struct mms_task_priv {
     time_t wakeup_time;                  /* Wake up time (if sleeping) */
 };
 
-G_DEFINE_TYPE(MMSTask, mms_task, G_TYPE_OBJECT)
+G_DEFINE_ABSTRACT_TYPE(MMSTask, mms_task, G_TYPE_OBJECT)
 
 #define MMS_TASK(obj) \
     (G_TYPE_CHECK_INSTANCE_CAST((obj), MMS_TYPE_TASK, MMSTask))
diff --git a/mms-lib/src/mms_transfer_list.c b/mms-lib/src/mms_transfer_list.c
index 0baf050..0545c07 100644
--- a/mms-lib/src/mms_transfer_list.c
+++ b/mms-lib/src/mms_transfer_list.c
@@ -19,7 +19,7 @@
 #define MMS_LOG_MODULE_NAME mms_transfer_list_log
 #include "mms_lib_log.h"
 
-G_DEFINE_TYPE(MMSTransferList, mms_transfer_list, G_TYPE_OBJECT)
+G_DEFINE_ABSTRACT_TYPE(MMSTransferList, mms_transfer_list, G_TYPE_OBJECT)
 
 #define MMS_TRANSFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), \
     MMS_TYPE_TRANSFER_LIST, MMSTransferList))