diff --git a/ESP32-IDF_ESPNOW-Transmitter/main/system_health.c b/ESP32-IDF_ESPNOW-Transmitter/main/system_health.c
index e2c30d58d..06900d481 100644
--- a/ESP32-IDF_ESPNOW-Transmitter/main/system_health.c
+++ b/ESP32-IDF_ESPNOW-Transmitter/main/system_health.c
@@ -6,7 +6,7 @@
 #include "system_health.h"
 
 static temperature_sensor_handle_t temp_sensor;
-const char *TAGt = "ESP-NOW_Transmitter"; 
+static const char *TAGt = "ESP-NOW_Transmitter"; 
 
 /*
     EXP32-C3 Chip built-in temprature sensor