diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 6d85ede..11f64a4 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -56,6 +56,7 @@
 extern struct workqueue_struct *ata_aux_wq;
 extern int atapi_enabled;
 extern int atapi_dmadir;
+extern int atapi_passthru16;
 extern int libata_fua;
 extern int libata_noacpi;
 extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);