diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index c426714..1f1e3a5 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -56,7 +56,7 @@
 extern int atapi_enabled;
 extern int atapi_dmadir;
 extern int libata_fua;
-extern int noacpi;
+extern int libata_noacpi;
 extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
 extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
 			   u64 block, u32 n_block, unsigned int tf_flags,