diff --git a/bsps/arm/stm32u5/start/stm32u5-config-rtc.c b/bsps/arm/stm32u5/start/stm32u5-config-rtc.c
index 9b63dc517e..c74ae3c279 100644
--- a/bsps/arm/stm32u5/start/stm32u5-config-rtc.c
+++ b/bsps/arm/stm32u5/start/stm32u5-config-rtc.c
@@ -45,7 +45,7 @@ RTC_HandleTypeDef hrtc  = { 0 };
 RTC_TimeTypeDef   sTime = { 0 };
 RTC_DateTypeDef   sDate = { 0 };
 
-void stm32u5_rtc_get_time( rtems_time_of_day *tod )
+static void stm32u5_rtc_get_time( rtems_time_of_day *tod )
 {
   if ( HAL_RTC_GetTime( &hrtc, &sTime, RTC_FORMAT_BIN ) != HAL_OK ) {
     bsp_fatal( STM32U5_FATAL_RTC );