diff --git a/drivers/scsi/aic94xx/aic94xx_dev.c b/drivers/scsi/aic94xx/aic94xx_dev.c
index c520e5b41fb52288982d73ac2ce46362407938d5..3dce618bf4148c293f4eff51b7f2ac27c1c22277 100644
--- a/drivers/scsi/aic94xx/aic94xx_dev.c
+++ b/drivers/scsi/aic94xx/aic94xx_dev.c
@@ -126,7 +126,7 @@ static inline int asd_init_sata(struct domain_device *dev)
 		if (w76 & 0x100) /* NCQ? */
 			qdepth = (w75 & 0x1F) + 1;
 		asd_ddbsite_write_dword(asd_ha, ddb, SATA_TAG_ALLOC_MASK,
-					(1<<qdepth)-1);
+					(1ULL<<qdepth)-1);
 		asd_ddbsite_write_byte(asd_ha, ddb, NUM_SATA_TAGS, qdepth);
 	}
 	if (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM ||