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 f77452431..54d67b7ea 100644
--- a/ESP32-IDF_Temperture-Node-v2/main/hello_world_main.c
+++ b/ESP32-IDF_Temperture-Node-v2/main/hello_world_main.c
@@ -13,6 +13,8 @@
 #include "esp_flash.h"
 #include "esp_system.h"
 
+static bme280_handle_t bme280 = NULL;
+
 void app_main(void)
 {
     printf("Hello world!\n");