diff --git a/tests/unittests/ui/stub_ui.c b/tests/unittests/ui/stub_ui.c
index 2e7ec7b1..0f4510c1 100644
--- a/tests/unittests/ui/stub_ui.c
+++ b/tests/unittests/ui/stub_ui.c
@@ -174,6 +174,8 @@ void privwin_occupant_banned(ProfPrivateWin *privwin, const char *const actor, c
 void privwin_occupant_online(ProfPrivateWin *privwin) {}
 void privwin_message_occupant_offline(ProfPrivateWin *privwin) {}
 
+void privwin_message_left_room(ProfPrivateWin *privwin) {}
+
 void ui_room_join(const char * const roomjid, gboolean focus) {}
 void ui_switch_to_room(const char * const roomjid) {}