diff --git a/Tools/autotest/sim_vehicle.py b/Tools/autotest/sim_vehicle.py
index f7a4eb3d74..6bc297416c 100755
--- a/Tools/autotest/sim_vehicle.py
+++ b/Tools/autotest/sim_vehicle.py
@@ -296,9 +296,10 @@ _options = {
             },
             "X": {
                 "waf_target": "bin/arducopter",
+                "default_params_filename": "default_params/copter.parm",
                 # this param set FRAME doesn't actually work because mavproxy
-                # won't set a parameter unless it knows of it, and the param fetch happens asynchronously
-        "default_params_filename": "default_params/copter.parm",
+                # won't set a parameter unless it knows of it, and the
+                # param fetch happens asynchronously
                 "extra_mavlink_cmds": "param fetch frame; param set FRAME 1;",
             },
             "hexa": {