diff --git a/drivers/isdn/act2000/capi.c b/drivers/isdn/act2000/capi.c
index 40395f567231570a10afa5040e09643b108016c0..afa46681f9833c576e3afd7b54f9a74debdac2bc 100644
--- a/drivers/isdn/act2000/capi.c
+++ b/drivers/isdn/act2000/capi.c
@@ -224,6 +224,7 @@ actcapi_manufacturer_req_net(act2000_card *card)
 /*
  * Switch V.42 on or off
  */
+#if 0
 int
 actcapi_manufacturer_req_v42(act2000_card *card, ulong arg)
 {
@@ -242,6 +243,7 @@ actcapi_manufacturer_req_v42(act2000_card *card, ulong arg)
 	ACTCAPI_QUEUE_TX;
         return 0;
 }
+#endif  /*  0  */
 
 /*
  * Set error-handler
diff --git a/drivers/isdn/act2000/capi.h b/drivers/isdn/act2000/capi.h
index 04d2bcdd37a724aac183b1f49de8e4552fb2af33..f6d5f530b86be8e3d434ca17244ff2b9591b2623 100644
--- a/drivers/isdn/act2000/capi.h
+++ b/drivers/isdn/act2000/capi.h
@@ -350,7 +350,6 @@ actcapi_nextsmsg(act2000_card *card)
 extern int actcapi_chkhdr(act2000_card *, actcapi_msghdr *);
 extern int actcapi_listen_req(act2000_card *);
 extern int actcapi_manufacturer_req_net(act2000_card *);
-extern int actcapi_manufacturer_req_v42(act2000_card *, ulong);
 extern int actcapi_manufacturer_req_errh(act2000_card *);
 extern int actcapi_manufacturer_req_msn(act2000_card *);
 extern int actcapi_connect_req(act2000_card *, act2000_chan *, char *, char, int, int);