diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index a8e3dfc..b864d3d 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -785,12 +785,12 @@
 		dev->dac_support = (dacmode!=0);
 	}
 	if(dev->dac_support != 0) {
-		if (!pci_set_dma_mask(dev->pdev, 0xFFFFFFFFFFFFFFFFULL) &&
-			!pci_set_consistent_dma_mask(dev->pdev, 0xFFFFFFFFFFFFFFFFULL)) {
+		if (!pci_set_dma_mask(dev->pdev, DMA_64BIT_MASK) &&
+			!pci_set_consistent_dma_mask(dev->pdev, DMA_64BIT_MASK)) {
 			printk(KERN_INFO"%s%d: 64 Bit DAC enabled\n",
 				dev->name, dev->id);
-		} else if (!pci_set_dma_mask(dev->pdev, 0xFFFFFFFFULL) &&
-			!pci_set_consistent_dma_mask(dev->pdev, 0xFFFFFFFFULL)) {
+		} else if (!pci_set_dma_mask(dev->pdev, DMA_32BIT_MASK) &&
+			!pci_set_consistent_dma_mask(dev->pdev, DMA_32BIT_MASK)) {
 			printk(KERN_INFO"%s%d: DMA mask set failed, 64 Bit DAC disabled\n",
 				dev->name, dev->id);
 			dev->dac_support = 0;