diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 333f045..5fafb63 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -230,8 +230,10 @@ static int ahci_host_init(struct ahci_uc_priv *uc_priv)
 	debug("cap 0x%x  port_map 0x%x  n_ports %d\n",
 	      uc_priv->cap, uc_priv->port_map, uc_priv->n_ports);
 
+#if !defined(CONFIG_DM_SCSI)
 	if (uc_priv->n_ports > CONFIG_SYS_SCSI_MAX_SCSI_ID)
 		uc_priv->n_ports = CONFIG_SYS_SCSI_MAX_SCSI_ID;
+#endif
 
 	for (i = 0; i < uc_priv->n_ports; i++) {
 		if (!(port_map & (1 << i)))