diff --git a/include/openbsc/silent_call.h b/include/openbsc/silent_call.h
index 619a543..5fec77b 100644
--- a/include/openbsc/silent_call.h
+++ b/include/openbsc/silent_call.h
@@ -3,9 +3,9 @@
 
 struct gsm_subscriber_connection;
 
-extern int gsm_silent_call_start(struct gsm_subscriber *subscr,
+extern int gsm_silent_call_start(struct vlr_subscr *vsub,
                                  void *data, int type);
-extern int gsm_silent_call_stop(struct gsm_subscriber *subscr);
+extern int gsm_silent_call_stop(struct vlr_subscr *vsub);
 
 #if 0
 extern int silent_call_rx(struct gsm_subscriber_connection *conn, struct msgb *msg);