diff --git a/ESP32-IDF_FreeRTOS/I2C_MultiDevice/main/hello_world_main.c b/ESP32-IDF_FreeRTOS/I2C_MultiDevice/main/hello_world_main.c
index ef1507e37..2c704e3c3 100644
--- a/ESP32-IDF_FreeRTOS/I2C_MultiDevice/main/hello_world_main.c
+++ b/ESP32-IDF_FreeRTOS/I2C_MultiDevice/main/hello_world_main.c
@@ -13,6 +13,7 @@
 #include "sdkconfig.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "freertos/semphr.h"
 #include "esp_chip_info.h"
 #include "esp_flash.h"
 #include "esp_system.h"