diff --git a/libraries/AP_HAL_Empty/AnalogIn.cpp b/libraries/AP_HAL_Empty/AnalogIn.cpp
index a2bb0e042b..2ce5b286a5 100644
--- a/libraries/AP_HAL_Empty/AnalogIn.cpp
+++ b/libraries/AP_HAL_Empty/AnalogIn.cpp
@@ -22,8 +22,9 @@ float AnalogSource::read_latest() {
     return _v;
 }
 
-void AnalogSource::set_pin(uint8_t p)
-{}
+bool AnalogSource::set_pin(uint8_t p) {
+    return true;
+}
 
 AnalogIn::AnalogIn()
 {}
diff --git a/libraries/AP_HAL_Empty/AnalogIn.h b/libraries/AP_HAL_Empty/AnalogIn.h
index 22dcb37c17..b297c93765 100644
--- a/libraries/AP_HAL_Empty/AnalogIn.h
+++ b/libraries/AP_HAL_Empty/AnalogIn.h
@@ -7,7 +7,7 @@ public:
     AnalogSource(float v);
     float read_average() override;
     float read_latest() override;
-    void set_pin(uint8_t p) override;
+    bool set_pin(uint8_t p) override;
     float voltage_average() override;
     float voltage_latest() override;
     float voltage_average_ratiometric() override { return voltage_average(); }