diff --git a/libraries/AP_HAL/AnalogIn.h b/libraries/AP_HAL/AnalogIn.h
index 9148ad05d9..2ae3b19e43 100644
--- a/libraries/AP_HAL/AnalogIn.h
+++ b/libraries/AP_HAL/AnalogIn.h
@@ -36,6 +36,10 @@ public:
 
     // power supply status flags, see MAV_POWER_STATUS
     virtual uint16_t power_status_flags(void) { return 0; }
+
+    // bitmask of all _power_flags bits ever set, so transient
+    // failures can still be diagnosed
+    virtual uint16_t accumulated_power_status_flags(void) const { return 0; }
 };
 
 #define ANALOG_INPUT_BOARD_VCC 254