diff --git a/libraries/AP_HAL_Linux/AnalogIn_ADS1115.h b/libraries/AP_HAL_Linux/AnalogIn_ADS1115.h
index ed5475d5d0..caf65b1ca0 100644
--- a/libraries/AP_HAL_Linux/AnalogIn_ADS1115.h
+++ b/libraries/AP_HAL_Linux/AnalogIn_ADS1115.h
@@ -25,14 +25,13 @@ private:
 class AnalogIn_ADS1115: public AP_HAL::AnalogIn {
 public:
     AnalogIn_ADS1115();
-    void init();
-    AP_HAL::AnalogSource* channel(int16_t n);
+
+    void init() override;
+    AP_HAL::AnalogSource *channel(int16_t n) override;
 
     /* Board voltage is not available */
-    float board_voltage(void)
-    {
-        return 0.0f;
-    }
+    float board_voltage() override { return 5.0f; }
+
 private:
     uint8_t _channels_number;
     void _update();