diff --git a/libraries/AP_BattMonitor/AP_BattMonitor_Bebop.h b/libraries/AP_BattMonitor/AP_BattMonitor_Bebop.h
index 8f800a9666..9f1e6a420f 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor_Bebop.h
+++ b/libraries/AP_BattMonitor/AP_BattMonitor_Bebop.h
@@ -26,7 +26,10 @@ class AP_BattMonitor_Bebop :public AP_BattMonitor_Backend
 public:
     // constructor. This incorporates initialisation as well.
     AP_BattMonitor_Bebop(AP_BattMonitor &mon, uint8_t instance, AP_BattMonitor::BattMonitor_State &mon_state):
-        AP_BattMonitor_Backend(mon, instance, mon_state)
+        AP_BattMonitor_Backend(mon, instance, mon_state),
+        _prev_vbat_raw(0.0f),
+        _prev_vbat(0.0f),
+        _battery_voltage_max(0.0f)
     {};
 
     virtual ~AP_BattMonitor_Bebop(void) {};