1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 3de11ddcf863..f0db38bd70e3 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -179,7 +179,7 @@ static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio)
         misc = addr_timings[clk][addr_pio];
 
         /* select Index-0/1 for Register-A/B */
-        write_reg(drive->select.b.unit, MISC_REG);
+        write_reg(drive->dn & 1, MISC_REG);
         /* set read cycle timings */
         write_reg(tim, READ_REG);
         /* set write cycle timings */