diff --git a/include/libopencm3/stm32/h7/flash.h b/include/libopencm3/stm32/h7/flash.h
index 3188a709..52b2c165 100644
--- a/include/libopencm3/stm32/h7/flash.h
+++ b/include/libopencm3/stm32/h7/flash.h
@@ -87,6 +87,7 @@
 #define FLASH_ACR_WRHF_VOS3_45MHZ     (0 << FLASH_ACR_WRHIGHFREQ_SHIFT)
 #define FLASH_ACR_WRHF_VOS3_135MHZ    (1 << FLASH_ACR_WRHIGHFREQ_SHIFT)
 #define FLASH_ACR_WRHF_VOS3_225MHZ    (2 << FLASH_ACR_WRHIGHFREQ_SHIFT)
+#define FLASH_ACR_WRHF_VOS3_275MHZ    (3 << FLASH_ACR_WRHIGHFREQ_SHIFT)
 /**@}*/
 #define FLASH_ACR_WRHIGHFREQ_MASK     (0x3)
 #define FLASH_ACR_WRHIGHFREQ_SHIFT    (0x4)