diff --git a/litex/soc/software/bios/boot.c b/litex/soc/software/bios/boot.c
index 34079b69d..7c62409e4 100755
--- a/litex/soc/software/bios/boot.c
+++ b/litex/soc/software/bios/boot.c
@@ -304,7 +304,11 @@ int serialboot(void)
 #define TFTP_SERVER_PORT 69
 #endif
 
+#ifdef MACADDR1
+static unsigned char macadr[6] = {MACADDR1, MACADDR2, MACADDR3, MACADDR4, MACADDR5, MACADDR6};
+#else
 static unsigned char macadr[6] = {0x10, 0xe2, 0xd5, 0x00, 0x00, 0x00};
+#endif
 
 #ifdef LOCALIP1
 static unsigned int local_ip[4] = {LOCALIP1, LOCALIP2, LOCALIP3, LOCALIP4};