diff --git a/libraries/SITL/SIM_FlightAxis.cpp b/libraries/SITL/SIM_FlightAxis.cpp
index a69087b3b0..8ecafb6260 100644
--- a/libraries/SITL/SIM_FlightAxis.cpp
+++ b/libraries/SITL/SIM_FlightAxis.cpp
@@ -80,6 +80,7 @@ static const struct {
     { "INS_ACCSCAL_X",     1.001 },
     { "INS_ACCSCAL_Y",     1.001 },
     { "INS_ACCSCAL_Z",     1.001 },
+    { "RPM_TYPE", 10 },
 };