diff --git a/ArduCopter/arming_checks.cpp b/ArduCopter/arming_checks.cpp
index c93699bcaf..d4737cb360 100644
--- a/ArduCopter/arming_checks.cpp
+++ b/ArduCopter/arming_checks.cpp
@@ -373,7 +373,7 @@ void Copter::pre_arm_rc_checks()
     }
 
     // check if radio has been calibrated
-    if (!channel_throttle->radio_min.configured() && !channel_throttle->radio_max.configured()) {
+    if (!channel_throttle->radio_min.configured() || !channel_throttle->radio_max.configured()) {
         return;
     }