diff --git a/workflow/scripts/experiment_design.py b/workflow/scripts/experiment_design.py
index 3a3be270fc11126e8c583ca61af6ae353a3c3303..ca135e8ec53bf0fc4d651192ca3645b57a975003 100644
--- a/workflow/scripts/experiment_design.py
+++ b/workflow/scripts/experiment_design.py
@@ -58,7 +58,7 @@ def make_experiment_design(design):
 
     for experiment, df_experiment in design.groupby('experiment_id'):
         experiment_file = experiment + '.tsv'
-        new_design.to_csv(experiment_file, header=True, sep='\t', index=False)
+        df_experiment.to_csv(experiment_file, header=True, sep='\t', index=False)
 
 
 def main():