diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index 89ece1c235aa7d4919a5efd505196137a156409c..66e21dd23154b4c5c27b0c254a3bfd348cc88d48 100644
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -357,6 +357,7 @@ static int mon_close(struct inode *inode, struct file *filp)
 	atomic_set(&monpriv->msglim_count, 0);
 	monpriv->write_index  = 0;
 	monpriv->read_index   = 0;
+	dev_set_drvdata(monreader_device, NULL);
 
 	for (i = 0; i < MON_MSGLIM; i++)
 		kfree(monpriv->msg_array[i]);