diff --git a/openbsc/tests/channel/channel_test.c b/openbsc/tests/channel/channel_test.c
index 440e180..ab0d9eb 100644
--- a/openbsc/tests/channel/channel_test.c
+++ b/openbsc/tests/channel/channel_test.c
@@ -89,6 +89,7 @@
 void gsm48_secure_channel() {}
 void paging_request_stop() {}
 void vty_out() {}
+void* connection_for_subscr(void) { abort(); return NULL; }
 
 
 struct tlv_definition nm_att_tlvdef;