diff --git a/drivers/isdn/mISDN/core.c b/drivers/isdn/mISDN/core.c
index e34a7a46754e8..8ec2d4d4f1352 100644
--- a/drivers/isdn/mISDN/core.c
+++ b/drivers/isdn/mISDN/core.c
@@ -294,20 +294,6 @@ get_Bprotocol4mask(u_int m)
 	return NULL;
 }
 
-struct Bprotocol *
-get_Bprotocol4id(u_int id)
-{
-	u_int	m;
-
-	if (id < ISDN_P_B_START || id > 63) {
-		printk(KERN_WARNING "%s id not in range  %d\n",
-		       __func__, id);
-		return NULL;
-	}
-	m = 1 << (id & ISDN_P_B_MASK);
-	return get_Bprotocol4mask(m);
-}
-
 int
 mISDN_register_Bprotocol(struct Bprotocol *bp)
 {
diff --git a/drivers/isdn/mISDN/core.h b/drivers/isdn/mISDN/core.h
index 42599f49c189d..5617c06de8e4d 100644
--- a/drivers/isdn/mISDN/core.h
+++ b/drivers/isdn/mISDN/core.h
@@ -55,7 +55,6 @@ extern void	__add_layer2(struct mISDNchannel *, struct mISDNstack *);
 
 extern u_int		get_all_Bprotocols(void);
 struct Bprotocol	*get_Bprotocol4mask(u_int);
-struct Bprotocol	*get_Bprotocol4id(u_int);
 
 extern int	mISDN_inittimer(u_int *);
 extern void	mISDN_timer_cleanup(void);