diff --git a/zh_ac_dimmer.c b/zh_ac_dimmer.c
index cfcc75f..fa236a1 100644
--- a/zh_ac_dimmer.c
+++ b/zh_ac_dimmer.c
@@ -164,7 +164,7 @@ void IRAM_ATTR _zh_ac_dimmer_isr_handler(void *arg)
             gpio_set_level(_init_config.triac_gpio, 1);
             return;
         }
-        _alarm_config.alarm_count = ((_current_frequency / 105) * (100 - _dimmer_value)) + _zero_cross_time;
+        _alarm_config.alarm_count = ((_current_frequency / 110) * (100 - _dimmer_value)) + _zero_cross_time;
         _alarm_config.flags.auto_reload_on_alarm = false;
         gptimer_set_alarm_action(_dimmer_timer, &_alarm_config);
         gptimer_start(_dimmer_timer);