diff --git a/ESP-IDF_Robot_RC/main/joystick.h b/ESP-IDF_Robot_RC/main/joystick.h
index a238b171c..603477812 100644
--- a/ESP-IDF_Robot_RC/main/joystick.h
+++ b/ESP-IDF_Robot_RC/main/joystick.h
@@ -7,6 +7,8 @@
 static unsigned uint8_t x = 0, y = 0;
 adc_oneshot_unit_handle_t adc1_x_handle;
 
+static esp_err_t joystick_adc_init() {}
+
 static void joystick_get_raw_xy() {
     ESP_ERROR_CHECK(adc_oneshot_read(adc1_x_handle, ADC1_CHANNEL_0, &x));
 }