diff --git a/src/northbridge/intel/i945/i945.h b/src/northbridge/intel/i945/i945.h
index 862af2a256..d4d35a2fa7 100644
--- a/src/northbridge/intel/i945/i945.h
+++ b/src/northbridge/intel/i945/i945.h
@@ -62,6 +62,8 @@
 #define BOARD_DEVEN ( DEVEN_D0F0 | DEVEN_D2F0 | DEVEN_D2F1 )
 #endif
 
+#define BSM		0x5c
+
 #define PAM0		0x90
 #define PAM1		0x91
 #define PAM2		0x92
diff --git a/src/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index 180ffde4c2..99b16de33a 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -97,7 +97,7 @@ static void pci_domain_set_resources(device_t dev)
 	printk(BIOS_DEBUG, "pci_tolm: 0x%x\n", pci_tolm);
 
 	printk(BIOS_SPEW, "Base of stolen memory: 0x%08x\n",
-		    pci_read_config32(dev_find_slot(0, PCI_DEVFN(2, 0)), 0x5c));
+		    pci_read_config32(dev_find_slot(0, PCI_DEVFN(2, 0)), BSM));
 
 	tolud = pci_read_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), 0x9c);
 	printk(BIOS_SPEW, "Top of Low Used DRAM: 0x%08x\n", tolud << 24);
diff --git a/src/northbridge/intel/i945/ram_calc.c b/src/northbridge/intel/i945/ram_calc.c
index 4ece5402fb..51eb0ff463 100644
--- a/src/northbridge/intel/i945/ram_calc.c
+++ b/src/northbridge/intel/i945/ram_calc.c
@@ -30,7 +30,7 @@ unsigned long get_top_of_ram(void)
 
 	if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & ((1 << 4) | (1 << 3))) {
 		/* IGD enabled, get top of Memory from BSM register */
-		tom = pci_read_config32(PCI_DEV(0,2,0), 0x5c);
+		tom = pci_read_config32(PCI_DEV(0,2,0), BSM);
 	} else {
 		tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24;
 	}