diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index e021ec6..5b8b859 100644
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -447,6 +447,7 @@
 	.release = &mon_close,
 	.read    = &mon_read,
 	.poll    = &mon_poll,
+	.llseek  = noop_llseek,
 };
 
 static struct miscdevice mon_dev = {