diff --git a/Inc/stm32l5xx_ll_tim.h b/Inc/stm32l5xx_ll_tim.h
index a43e9e1..435381e 100644
--- a/Inc/stm32l5xx_ll_tim.h
+++ b/Inc/stm32l5xx_ll_tim.h
@@ -1307,7 +1307,7 @@
   * @retval Prescaler value  (between Min_Data=0 and Max_Data=65535)
   */
 #define __LL_TIM_CALC_PSC(__TIMCLK__, __CNTCLK__)   \
-  (((__TIMCLK__) >= (__CNTCLK__)) ? (uint32_t)(((__TIMCLK__)/(__CNTCLK__)) - 1U) : 0U)
+  (((__TIMCLK__) >= (__CNTCLK__)) ? (uint32_t)((((__TIMCLK__) + (__CNTCLK__)/2U)/(__CNTCLK__)) - 1U) : 0U)
 
 /**
   * @brief  HELPER macro calculating the auto-reload value to achieve the required output signal frequency.