diff --git a/boards/arm/stm32h735g_disco/Kconfig.defconfig b/boards/arm/stm32h735g_disco/Kconfig.defconfig
index e13cae9e3ae..b7f3f4bf347 100644
--- a/boards/arm/stm32h735g_disco/Kconfig.defconfig
+++ b/boards/arm/stm32h735g_disco/Kconfig.defconfig
@@ -12,5 +12,9 @@ config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI
 
+choice STM32_LPTIM_CLOCK
+	default STM32_LPTIM_CLOCK_LSE
+	depends on STM32_LPTIM_TIMER
+endchoice
 
 endif # BOARD_STM32H735G_DISCO
diff --git a/boards/arm/stm32h735g_disco/stm32h735g_disco.dts b/boards/arm/stm32h735g_disco/stm32h735g_disco.dts
index 91e915cc184..1867493182f 100644
--- a/boards/arm/stm32h735g_disco/stm32h735g_disco.dts
+++ b/boards/arm/stm32h735g_disco/stm32h735g_disco.dts
@@ -51,6 +51,10 @@
 	status = "okay";
 };
 
+&clk_lse {
+	status = "okay";
+};
+
 &pll {
 	div-m = <5>;
 	mul-n = <110>;