diff --git a/ESP32-IDF_Temperture-Node-v2/main/hello_world_main.c b/ESP32-IDF_Temperture-Node-v2/main/hello_world_main.c
index 9655bc4ea..5e3516099 100644
--- a/ESP32-IDF_Temperture-Node-v2/main/hello_world_main.c
+++ b/ESP32-IDF_Temperture-Node-v2/main/hello_world_main.c
@@ -39,7 +39,7 @@ i2c_config_t conf = {
     .sda_pullup_en = GPIO_PULLUP_ENABLE,
     .scl_io_num = 22,
     .sda_pullup_en = GPIO_PULLUP_ENABLE,
-    .master.clk_speed = I2C_MASTER_FREQ_HZ,
+    .master.clk_speed = 400000,
     .clk_flags= 0,
 };