diff --git a/Tools/autotest/ardusub.py b/Tools/autotest/ardusub.py
index 5409756931..2d0191f46c 100644
--- a/Tools/autotest/ardusub.py
+++ b/Tools/autotest/ardusub.py
@@ -104,7 +104,7 @@ class AutoTestSub(AutoTest):
 
 
         self.set_rc(Joystick.Throttle, 1000)
-        self.wait_altitude(alt_min=-6, alt_max=-5)
+        self.wait_altitude(altitude_min=-6, altitude_max=-5)
         self.set_rc(Joystick.Throttle, 1500)
 
         # let the vehicle settle (momentum / stopping point shenanigans....)
@@ -113,7 +113,7 @@ class AutoTestSub(AutoTest):
         self.watch_altitude_maintained()
 
         self.set_rc(Joystick.Throttle, 1000)
-        self.wait_altitude(alt_min=-20, alt_max=-19)
+        self.wait_altitude(altitude_min=-20, altitude_max=-19)
         self.set_rc(Joystick.Throttle, 1500)
 
         # let the vehicle settle (momentum / stopping point shenanigans....)
@@ -122,7 +122,7 @@ class AutoTestSub(AutoTest):
         self.watch_altitude_maintained()
 
         self.set_rc(Joystick.Throttle, 1900)
-        self.wait_altitude(alt_min=-14, alt_max=-13)
+        self.wait_altitude(altitude_min=-14, altitude_max=-13)
         self.set_rc(Joystick.Throttle, 1500)
 
         # let the vehicle settle (momentum / stopping point shenanigans....)
@@ -131,7 +131,7 @@ class AutoTestSub(AutoTest):
         self.watch_altitude_maintained()
 
         self.set_rc(Joystick.Throttle, 1900)
-        self.wait_altitude(alt_min=-5, alt_max=-4)
+        self.wait_altitude(altitude_min=-5, altitude_max=-4)
         self.set_rc(Joystick.Throttle, 1500)
 
         # let the vehicle settle (momentum / stopping point shenanigans....)