diff --git a/ports/stm32/extint.h b/ports/stm32/extint.h
index 792eda19f5..7646df731c 100644
--- a/ports/stm32/extint.h
+++ b/ports/stm32/extint.h
@@ -41,6 +41,9 @@
 #if defined(STM32F0) || defined(STM32L4)
 #define EXTI_RTC_TIMESTAMP      (19)
 #define EXTI_RTC_WAKEUP         (20)
+#elif defined(STM32H7)
+#define EXTI_RTC_TIMESTAMP      (18)
+#define EXTI_RTC_WAKEUP         (19)
 #else
 #define EXTI_RTC_TIMESTAMP      (21)
 #define EXTI_RTC_WAKEUP         (22)