diff --git a/ArduPlane/AP_Arming.h b/ArduPlane/AP_Arming.h
index 13ddc2c1de..1ca909a50e 100644
--- a/ArduPlane/AP_Arming.h
+++ b/ArduPlane/AP_Arming.h
@@ -8,6 +8,12 @@
 class AP_Arming_Plane : public AP_Arming
 {
 public:
+    enum ArmingRudder {
+        ARMING_RUDDER_DISABLED  = 0,
+        ARMING_RUDDER_ARMONLY   = 1,
+        ARMING_RUDDER_ARMDISARM = 2
+    };
+
     AP_Arming_Plane(const AP_AHRS &ahrs_ref, const AP_Baro &baro, Compass &compass,
                     const AP_BattMonitor &battery) :
         AP_Arming(ahrs_ref, baro, compass, battery) {
@@ -16,6 +22,8 @@ public:
     bool pre_arm_checks(bool report);
     bool arm(uint8_t method) override;
 
+    ArmingRudder rudder_arming() const { return (ArmingRudder)rudder_arming_value.get(); }
+
     // var_info for holding Parameter information
     static const struct AP_Param::GroupInfo var_info[];
 
diff --git a/ArduPlane/radio.cpp b/ArduPlane/radio.cpp
index 9199e9e693..cbf0b6d4f0 100644
--- a/ArduPlane/radio.cpp
+++ b/ArduPlane/radio.cpp
@@ -103,9 +103,9 @@ void Plane::init_rc_out_aux()
 */
 void Plane::rudder_arm_disarm_check()
 {
-    AP_Arming::ArmingRudder arming_rudder = arming.rudder_arming();
+    AP_Arming_Plane::ArmingRudder arming_rudder = arming.rudder_arming();
 
-    if (arming_rudder == AP_Arming::ARMING_RUDDER_DISABLED) {
+    if (arming_rudder == AP_Arming_Plane::ARMING_RUDDER_DISABLED) {
         //parameter disallows rudder arming/disabling
         return;
     }
@@ -144,7 +144,7 @@ void Plane::rudder_arm_disarm_check()
 			// not at full right rudder
 			rudder_arm_timer = 0;
 		}
-	} else if (arming_rudder == AP_Arming::ARMING_RUDDER_ARMDISARM && !is_flying()) {
+	} else if (arming_rudder == AP_Arming_Plane::ARMING_RUDDER_ARMDISARM && !is_flying()) {
 		// when armed and not flying, full left rudder starts disarming counter
 		if (channel_rudder->get_control_in() < -4000) {
 			uint32_t now = millis();