diff --git a/hw/mcu/stm/stm32f1xx/src/rtc_tick_stm32f1xx.c b/hw/mcu/stm/stm32f1xx/src/rtc_tick_stm32f1xx.c
index 3220991f32..9f27be4f17 100644
--- a/hw/mcu/stm/stm32f1xx/src/rtc_tick_stm32f1xx.c
+++ b/hw/mcu/stm/stm32f1xx/src/rtc_tick_stm32f1xx.c
@@ -120,6 +120,7 @@ os_tick_init(uint32_t os_ticks_per_sec, int prio)
         .PeriphClockSelection = RCC_PERIPHCLK_RTC,
         .RTCClockSelection = RCC_RTCCLKSOURCE_LSE,
     };
+    SysTick->CTRL = 0;
 
     HAL_RCCEx_PeriphCLKConfig(&clock_init);
     __HAL_RCC_RTC_ENABLE();