diff --git a/Tools/autotest/arduplane.py b/Tools/autotest/arduplane.py
index 82b2618038..dc87335d1d 100644
--- a/Tools/autotest/arduplane.py
+++ b/Tools/autotest/arduplane.py
@@ -3765,7 +3765,7 @@ function'''
              self.test_imu_tempcal),
 
             ("MAV_DO_AUX_FUNCTION",
-             "Test triggering Auxillary Functions via mavlink",
+             "Test triggering Auxiliary Functions via mavlink",
              self.fly_aux_function),
 
             ("SmartBattery",