diff --git a/villas/dataprocessing/readtools.py b/villas/dataprocessing/readtools.py
index c78b6dd67c1c560af856fa8b6f4678c629d82ccc..157681d1110b038c96d03146f4b924c597953682 100644
--- a/villas/dataprocessing/readtools.py
+++ b/villas/dataprocessing/readtools.py
@@ -4,7 +4,7 @@
 import numpy as np
 import pandas as pd
 import re
-from timeseries import *
+from .timeseries import *
 
 
 def read_timeseries_Modelica(filename, timeseries_names=None, is_regex=False):