diff --git a/flashrom.c b/flashrom.c
index 39ed19b..63aba1e 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -74,8 +74,8 @@
 
 	for (temp = pacc->devices; temp; temp = temp->next)
 		if (pci_filter_match(&filter, temp)) {
-			if ((card_vendor == pci_read_word(temp, 0x2C)) &&
-			    (card_device == pci_read_word(temp, 0x2E)))
+			if ((card_vendor == pci_read_word(temp, PCI_SUBSYSTEM_VENDOR_ID)) &&
+			    (card_device == pci_read_word(temp, PCI_SUBSYSTEM_ID)))
 				return temp;
 		}