diff --git a/arch/arm/src/stm32/Kconfig b/arch/arm/src/stm32/Kconfig
index c7c46b0403..5dd9f299dc 100644
--- a/arch/arm/src/stm32/Kconfig
+++ b/arch/arm/src/stm32/Kconfig
@@ -3251,11 +3251,13 @@ config RTC_LSECLOCK
 
 config RTC_LSICLOCK
 	bool "LSI clock"
+	depends on !STM32_STM32L15XX
 	---help---
 		Drive the RTC with the LSI clock
 
 config RTC_HSECLOCK
 	bool "HSE clock"
+	depends on !STM32_STM32L15XX
 	---help---
 		Drive the RTC with the HSE clock, divided down to 1MHz.
 
diff --git a/arch/arm/src/stm32/stm32_rtcc.c b/arch/arm/src/stm32/stm32_rtcc.c
index 817111d587..ea49fa2e6a 100644
--- a/arch/arm/src/stm32/stm32_rtcc.c
+++ b/arch/arm/src/stm32/stm32_rtcc.c
@@ -51,6 +51,8 @@
 
 #include "up_arch.h"
 
+#include "stm32_rcc.h"
+#include "stm32_pwr.h"
 #include "stm32_rtc.h"
 
 #ifdef CONFIG_RTC
@@ -77,6 +79,14 @@
 #  undef CONFIG_DEBUG_RTC
 #endif
 
+#ifdef CONFIG_STM32_STM32L15XX
+#  if defined(CONFIG_RTC_HSECLOCK)
+#    error "RTC with HSE clock not yet implemented for STM32L15XXX"
+#  elif defined(CONFIG_RTC_LSICLOCK)
+#    error "RTC with LSI clock not yet implemented for STM32L15XXX"
+#  endif
+#endif
+
 /* Constants ************************************************************************/
 
 #define SYNCHRO_TIMEOUT  (0x00020000)
@@ -435,6 +445,7 @@ static int rtc_setup(void)
   uint32_t regval;
   int ret;
 
+#ifndef CONFIG_STM32_STM32L15XX
   /* We might be changing RTCSEL - to ensure such changes work, we must reset the
    * backup domain
    */
@@ -475,6 +486,12 @@ static int rtc_setup(void)
   stm32_rcc_enablelse();
 
 #endif
+#else
+  /* Enable the LSE clock */
+
+  stm32_rcc_enablelse();
+
+#endif /* CONFIG_STM32_STM32L15XX */
 
   /* Wait for the RTC Time and Date registers to be synchronized with RTC APB
    * clock.