diff --git a/mdevaluate/reader.py b/mdevaluate/reader.py
index 3e7bae6..1eb3cab 100755
--- a/mdevaluate/reader.py
+++ b/mdevaluate/reader.py
@@ -17,6 +17,7 @@ from zipfile import BadZipFile
 import builtins
 import warnings
 import subprocess 
+import re
 
 import numpy as np
 import MDAnalysis as mdanalysis