diff --git a/libraries/AP_HAL_Empty/AnalogIn.cpp b/libraries/AP_HAL_Empty/AnalogIn.cpp
index 9c8ee0b9d7..d2e66797f9 100644
--- a/libraries/AP_HAL_Empty/AnalogIn.cpp
+++ b/libraries/AP_HAL_Empty/AnalogIn.cpp
@@ -43,5 +43,5 @@ AP_HAL::AnalogSource* AnalogIn::channel(int16_t n) {
 
 float AnalogIn::board_voltage(void)
 {
-    return 0;
+    return 5.0f;
 }