diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 65d8273..5052f80 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -61,7 +61,7 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 	}
 
 	addr = pci_dev_base(seg, bus, devfn);
-	if (!addr)
+	if (!addr || reg < 256) /* Use type 1 for non-extended access */
 		return pci_conf1_read(seg,bus,devfn,reg,len,value);
 
 	switch (len) {
@@ -89,7 +89,7 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 		return -EINVAL;
 
 	addr = pci_dev_base(seg, bus, devfn);
-	if (!addr)
+	if (!addr || reg < 256) /* Use type 1 for non-extended access */
 		return pci_conf1_write(seg,bus,devfn,reg,len,value);
 
 	switch (len) {