diff --git a/drivers/scsi/sata_sis.c b/drivers/scsi/sata_sis.c
index 237c1986f012..b227e51d12f4 100644
--- a/drivers/scsi/sata_sis.c
+++ b/drivers/scsi/sata_sis.c
@@ -161,7 +161,7 @@ static u32 sis_scr_cfg_read (struct ata_port *ap, unsigned int sc_reg)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
 	unsigned int cfg_addr = get_scr_cfg_addr(ap->port_no, sc_reg, pdev->device);
-	u32 val, val2;
+	u32 val, val2 = 0;
 	u8 pmr;
 
 	if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */