diff --git a/Tools/autotest/rover.py b/Tools/autotest/rover.py
index e207448642..09f519933c 100644
--- a/Tools/autotest/rover.py
+++ b/Tools/autotest/rover.py
@@ -3696,7 +3696,7 @@ Brakes have negligible effect (with=%0.2fm without=%0.2fm delta=%0.2fm)
 #        oldalt = downloaded_items[changealt_item].z
         want_newalt = 37.2
         mavproxy.send('wp changealt %u %f\n' % (changealt_item, want_newalt))
-        self.delay_sim_time(5)
+        self.delay_sim_time(15)
         downloaded_items = self.download_using_mission_protocol(mavutil.mavlink.MAV_MISSION_TYPE_MISSION)
         if abs(downloaded_items[changealt_item].z - want_newalt) > 0.0001:
             raise NotAchievedException(