diff --git a/drivers/ide/ns87415.c b/drivers/ide/ns87415.c
index cbc1d11..13a9e00 100644
--- a/drivers/ide/ns87415.c
+++ b/drivers/ide/ns87415.c
@@ -74,7 +74,7 @@
 	}
 
 	/* be sure we're looking at the low order bits */
-	outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = inb(io_ports->feature_addr);
@@ -90,7 +90,7 @@
 		tf->device = superio_ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature = inb(io_ports->feature_addr);