diff --git a/include/zh_ac_dimmer.h b/include/zh_ac_dimmer.h
index 612589d..55d3bef 100644
--- a/include/zh_ac_dimmer.h
+++ b/include/zh_ac_dimmer.h
@@ -34,7 +34,7 @@ extern "C"
         uint8_t zero_cross_gpio; /*!< Zero cross GPIO. */
         uint8_t triac_gpio;      /*!< Triac GPIO. */
         uint8_t glitch_filter;   /*!< Zero cross interrupt glitch filter (in us). */
-        uint8_t ac_frequency;    /*!< AC frequency (50 - 400 Hz). */
+        uint16_t ac_frequency;   /*!< AC frequency (50 - 400 Hz). */
     } zh_ac_dimmer_init_config_t;
 
     /**