diff --git a/user_libs/optimisation_taguchi/plot_results.py b/user_libs/optimisation_taguchi/plot_results.py
index 7cf37028..6fbefd8b 100644
--- a/user_libs/optimisation_taguchi/plot_results.py
+++ b/user_libs/optimisation_taguchi/plot_results.py
@@ -5,7 +5,9 @@
 #
 # Please use the attribution at http://dx.doi.org/10.1190/1.3548506
 
-import argparse, os, pickle
+import argparse,
+import os
+import pickle
 
 from gprMax.optimisation_taguchi import plot_optimisation_history