diff --git a/drivers/counter/counter_ll_stm32_rtc.c b/drivers/counter/counter_ll_stm32_rtc.c
index 3cb67009ccb..4549a79ffb3 100644
--- a/drivers/counter/counter_ll_stm32_rtc.c
+++ b/drivers/counter/counter_ll_stm32_rtc.c
@@ -451,15 +451,15 @@ static int rtc_stm32_init(const struct device *dev)
 static struct rtc_stm32_data rtc_data;
 
 #if DT_INST_NUM_CLOCKS(0) == 1
-#warning Kconfig COUNTER_RTC_STM32_CLOCK_LS* are deprecated. Please define clock source in dtsi file
+#warning STM32 RTC needs a kernel source clock. Please define it in dts file
 static const struct stm32_pclken rtc_clk[] = {
 	STM32_CLOCK_INFO(0, DT_DRV_INST(0)),
-	/* Use Kconfig to configure source clocks fields */
+	/* Use Kconfig to configure source clocks fields (Deprecated) */
 	/* Fortunately, values are consistent across enabled series */
-#ifdef COUNTER_RTC_STM32_CLOCK_LSI
-	{.bus = STM32_SRC_LSI, .enr = RTC_SEL(2)}
-#else
+#ifdef CONFIG_COUNTER_RTC_STM32_CLOCK_LSE
 	{.bus = STM32_SRC_LSE, .enr = RTC_SEL(1)}
+#else
+	{.bus = STM32_SRC_LSI, .enr = RTC_SEL(2)}
 #endif
 };
 #else