diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index d5b10ecde4a03e4a9b312839b577bf43442c7627..ab22ccf4c7d3ad16db819facb88a7890f2f32663 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -3192,7 +3192,7 @@ static void
 qla2x00_iidma_fcport(scsi_qla_host_t *vha, fc_port_t *fcport)
 {
 	int rval;
-	uint16_t mb[4];
+	uint16_t mb[MAILBOX_REGISTER_COUNT];
 	struct qla_hw_data *ha = vha->hw;
 
 	if (!IS_IIDMA_CAPABLE(ha))