diff --git a/src/northsouthbridge/sis/550/southbridge.c b/src/northsouthbridge/sis/550/southbridge.c
index f1aaeebcfe..af5f7725a7 100644
--- a/src/northsouthbridge/sis/550/southbridge.c
+++ b/src/northsouthbridge/sis/550/southbridge.c
@@ -140,8 +140,8 @@ void nvram_on()
 		/* Enable FFF80000 to FFFFFFFF decode. You have to also enable
 		   PCI Posted write for devices on sourthbridge */
 		pci_write_config_byte(pcidev, 0x40, 0x33);
-		/* Enable USB device in undocumented Bit 5 */
-		pci_write_config_byte(pcidev, 0x45, 0x20);
+		/* Enable flash write in bit 6 and USB device in undocumented Bit 5 */
+		pci_write_config_byte(pcidev, 0x45, 0x60);
 	}
 
 	/* turn off nvram shadow in 0xc0000 ~ 0xfffff, i.e. accessing segment C - F