diff --git a/wofost_ensemble_parameters.py b/wofost_ensemble_parameters.py
index be90afd..2726982 100644
--- a/wofost_ensemble_parameters.py
+++ b/wofost_ensemble_parameters.py
@@ -28,6 +28,7 @@
 # Generate output folder name from parameters
 if args.output_dir is None:
     variable_names = args.parameter_names + ["DOS"] if args.sowdates else args.parameter_names
+    variable_names = sorted(variable_names)
     args.output_dir = fpcup.settings.DEFAULT_OUTPUT / "-".join(variable_names)
 
 ### Load constants