diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 93de0b46b489..f0e57aefb5f2 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -127,7 +127,6 @@ extern int cio_resume (struct subchannel *);
 extern int cio_halt (struct subchannel *);
 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
-extern int cio_cancel (struct subchannel *);
 extern int cio_set_options (struct subchannel *, int);
 extern int cio_update_schib(struct subchannel *sch);
 extern int cio_commit_config(struct subchannel *sch);