diff --git a/libraries/RC_Channel/RC_Channel.h b/libraries/RC_Channel/RC_Channel.h
index 257fb98ccc..871b3affda 100644
--- a/libraries/RC_Channel/RC_Channel.h
+++ b/libraries/RC_Channel/RC_Channel.h
@@ -491,7 +491,7 @@ public:
     void reset_mode_switch();
     virtual void read_mode_switch();
 
-    // has_valid_input should be pure-virtual when Plane is converted
+    virtual bool in_rc_failsafe() const { return true; };
     virtual bool has_valid_input() const { return false; };
 
     virtual RC_Channel *get_arming_channel(void) const { return nullptr; };