diff --git a/include/hw/misc/aspeed_scu.h b/include/hw/misc/aspeed_scu.h
index a6739bb846b6..9cd530afa23a 100644
--- a/include/hw/misc/aspeed_scu.h
+++ b/include/hw/misc/aspeed_scu.h
@@ -286,6 +286,7 @@ uint32_t aspeed_scu_get_apb_freq(AspeedSCUState *s);
 #define SCU_AST2500_HW_STRAP_ESPI_FLASH_ENABLE     (0x1 << 26)
 #define SCU_AST2500_HW_STRAP_ESPI_ENABLE           (0x1 << 25)
 #define SCU_AST2500_HW_STRAP_DDR4_ENABLE           (0x1 << 24)
+#define SCU_AST2500_HW_STRAP_25HZ_CLOCK_MODE       (0x1 << 23)
 
 #define SCU_AST2500_HW_STRAP_ACPI_ENABLE           (0x1 << 19)
 #define SCU_AST2500_HW_STRAP_USBCKI_FREQ           (0x1 << 18)