diff --git a/include/osmocom/vty/logging.h b/include/osmocom/vty/logging.h
index 1baa3f8..90c8fa1 100644
--- a/include/osmocom/vty/logging.h
+++ b/include/osmocom/vty/logging.h
@@ -7,5 +7,6 @@
 
 struct log_info;
 void logging_vty_add_cmds();
+void logging_vty_add_deprecated_subsys(void *ctx, const char *name);
 struct vty;
 struct log_target *osmo_log_vty2tgt(struct vty *vty);