diff --git a/sys/dev/pci/viaide.c b/sys/dev/pci/viaide.c
index fcb5524f772..47ffc303206 100644
--- a/sys/dev/pci/viaide.c
+++ b/sys/dev/pci/viaide.c
@@ -1238,4 +1238,7 @@ via_sata_chip_map_new(struct pciide_softc *sc,
 		wdr->data32ioh = wdr->cmd_iohs[wd_data];
 		wdcattach(wdc_cp);
 	}
+	pcireg_t value = pci_conf_read(sc->sc_pc, sc->sc_tag, 0x50);
+	value |= 0x00040000;
+	pci_conf_write(sc->sc_pc, sc->sc_tag, 0x50, value);
 }