diff --git a/drivers/clock_control/clock_stm32_ll_u5.c b/drivers/clock_control/clock_stm32_ll_u5.c
index ac01c36e262..1e999940462 100644
--- a/drivers/clock_control/clock_stm32_ll_u5.c
+++ b/drivers/clock_control/clock_stm32_ll_u5.c
@@ -416,6 +416,9 @@ int stm32_clock_control_init(const struct device *dev)
 
 	ARG_UNUSED(dev);
 
+	/* Current hclk value */
+	old_hclk_freq = __LL_RCC_CALC_HCLK_FREQ(get_startup_frequency(), LL_RCC_GetAHBPrescaler());
+
 	/* Set up indiviual enabled clocks */
 	set_up_fixed_clock_sources();
 
@@ -428,9 +431,6 @@ int stm32_clock_control_init(const struct device *dev)
 	/* Set voltage regulator to comply with targeted system frequency */
 	set_regu_voltage(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC);
 
-	/* Current hclk value */
-	old_hclk_freq = __LL_RCC_CALC_HCLK_FREQ(get_startup_frequency(), LL_RCC_GetAHBPrescaler());
-
 	/* Set flash latency */
 	/* If freq increases, set flash latency before any clock setting */
 	if (old_hclk_freq < CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC) {