diff --git a/libraries/SITL/SIM_FlightAxis.cpp b/libraries/SITL/SIM_FlightAxis.cpp
index 7bae02170c..90837a1549 100644
--- a/libraries/SITL/SIM_FlightAxis.cpp
+++ b/libraries/SITL/SIM_FlightAxis.cpp
@@ -45,6 +45,7 @@ static const struct {
     { "BRD_OPTIONS", 0},
     { "AHRS_EKF_TYPE", 10 },
     { "INS_GYR_CAL", 0 },
+    { "BATT_MONITOR", 4 },
     { "RC1_MIN", 1000, true },
     { "RC1_MAX", 2000, true },
     { "RC2_MIN", 1000, true },