diff --git a/openbsc/tests/channel/channel_test.c b/openbsc/tests/channel/channel_test.c
index a63d8a5..8403997 100644
--- a/openbsc/tests/channel/channel_test.c
+++ b/openbsc/tests/channel/channel_test.c
@@ -78,6 +78,7 @@
 void gsm_net_update_ctype(struct gsm_network *network) {}
 void gsm48_secure_channel() {}
 void paging_request_stop() {}
+void vty_out() {}
 
 
 struct tlv_definition nm_att_tlvdef;