diff --git a/ArduPlane/Plane.h b/ArduPlane/Plane.h
index bc9818104a..aa88d6feef 100644
--- a/ArduPlane/Plane.h
+++ b/ArduPlane/Plane.h
@@ -289,7 +289,6 @@ private:
     // This is the state of the flight control system
     // There are multiple states defined such as MANUAL, FBW-A, AUTO
     Mode *control_mode = &mode_initializing;
-    ModeReason control_mode_reason = ModeReason::UNKNOWN;
     Mode *previous_mode = &mode_initializing;
     ModeReason previous_mode_reason = ModeReason::UNKNOWN;