diff --git a/cores/arduino/stm32/backup.h b/cores/arduino/stm32/backup.h
index 6a2be641d5..0bb479d936 100644
--- a/cores/arduino/stm32/backup.h
+++ b/cores/arduino/stm32/backup.h
@@ -24,6 +24,7 @@
/* Includes ------------------------------------------------------------------*/
#include "stm32_def.h"
#include "stm32yyxx_ll_rtc.h"
+#include "stm32yyxx_ll_pwr.h"
#ifdef __cplusplus
extern "C" {
@@ -128,7 +129,7 @@ static inline void setBackupRegister(uint32_t index, uint32_t value)
#else
LL_RTC_BKP_SetRegister(TAMP, index, value);
#endif
-#elif defined(BKPREG1)
+#elif defined(PWR_BKP0R)
LL_PWR_BKP_SetRegister(index, value);
#else
UNUSED(index);
@@ -152,7 +153,7 @@ static inline uint32_t getBackupRegister(uint32_t index)
#else
return LL_RTC_BKP_GetRegister(TAMP, index);
#endif
-#elif defined(BKPREG1)
+#elif defined(PWR_BKP0R)
return LL_PWR_BKP_GetRegister(index);
#else
UNUSED(index);
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