diff --git a/arch/xtensa/src/esp32s2/esp32s2_rt_timer.c b/arch/xtensa/src/esp32s2/esp32s2_rt_timer.c
index 5c7664c38f..20539badd1 100644
--- a/arch/xtensa/src/esp32s2/esp32s2_rt_timer.c
+++ b/arch/xtensa/src/esp32s2/esp32s2_rt_timer.c
@@ -176,6 +176,7 @@ static void start_rt_timer(struct rt_timer_s *timer,
         {
           /* Reset the hardware timer alarm */
 
+          ESP32S2_TIM_SETALRM(priv->timer, false);
           ESP32S2_TIM_SETALRVL(priv->timer, USEC_TO_CYCLES(timer->alarm));
           ESP32S2_TIM_SETALRM(priv->timer, true);
         }
@@ -254,6 +255,7 @@ static void stop_rt_timer(struct rt_timer_s *timer)
                                         list);
               alarm = next_timer->alarm;
 
+              ESP32S2_TIM_SETALRM(priv->timer, false);
               ESP32S2_TIM_SETALRVL(priv->timer, USEC_TO_CYCLES(alarm));
               ESP32S2_TIM_SETALRM(priv->timer, true);
             }
@@ -473,6 +475,8 @@ static int rt_timer_isr(int irq, void *context, void *arg)
               timer = container_of(priv->runlist.next,
                                    struct rt_timer_s, list);
               alarm = timer->alarm;
+
+              ESP32S2_TIM_SETALRM(priv->timer, false);
               ESP32S2_TIM_SETALRVL(priv->timer, USEC_TO_CYCLES(alarm));
             }
         }