diff --git a/os/hal/platforms/STM32/RTCv1/rtc_lld.h b/os/hal/platforms/STM32/RTCv1/rtc_lld.h
index 6f55ab573..8d0f65380 100644
--- a/os/hal/platforms/STM32/RTCv1/rtc_lld.h
+++ b/os/hal/platforms/STM32/RTCv1/rtc_lld.h
@@ -53,6 +53,16 @@
 /* Driver pre-compile time settings.                                         */
 /*===========================================================================*/
 
+/**
+ * @name    Configuration options
+ * @{
+ */
+/*
+ * RTC driver system settings.
+ */
+#define STM32_RTC_IRQ_PRIORITY      15
+/** @} */
+
 /*===========================================================================*/
 /* Derived constants and error checks.                                       */
 /*===========================================================================*/