diff --git a/lib/mks-session.h b/lib/mks-session.h
index 8a3ad01..0092596 100644
--- a/lib/mks-session.h
+++ b/lib/mks-session.h
@@ -61,4 +61,6 @@ const char      *mks_session_get_uuid                  (MksSession           *se
 MKS_AVAILABLE_IN_ALL
 MksScreen       *mks_session_ref_screen                (MksSession           *self);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (MksSpeaker, g_object_unref)
+
 G_END_DECLS