diff --git a/ESP-IDF_Robot/main/blink_example_main.c b/ESP-IDF_Robot/main/blink_example_main.c
index 8aed7a4e5..2b7ad6ad3 100644
--- a/ESP-IDF_Robot/main/blink_example_main.c
+++ b/ESP-IDF_Robot/main/blink_example_main.c
@@ -781,7 +781,7 @@ void app_main(void)
     /*
         ADC
     */
-    esp_err_t ret;
+    esp_err_t adc_ret;
     uint32_t ret_num = 0;
     uint8_t result[READ_LEN] = {0};
     memset(result, 0xcc, READ_LEN);