diff --git a/flashchips.h b/flashchips.h
index 4dce573..f4880d6 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -491,6 +491,7 @@
 #define MACRONIX_MX25U6435E	0x2537	/* Same as MX25U6435F */
 #define MACRONIX_MX25U12835E	0x2538	/* Same as MX25U12835F */
 #define MACRONIX_MX25U25635F	0x2539
+#define MACRONIX_MX25U51245G	0x253a
 #define MACRONIX_MX25L3235D	0x5E16	/* MX25L3225D/MX25L3235D/MX25L3237D */
 #define MACRONIX_MX25L6495F	0x9517