diff --git a/pylot/core/pick/utils.py b/pylot/core/pick/utils.py
index 4c2e8baf..0b321098 100644
--- a/pylot/core/pick/utils.py
+++ b/pylot/core/pick/utils.py
@@ -7,6 +7,7 @@
 
    :author: Ludger Kueperkoch, BESTEC GmbH
 """
+import warnings
 
 import matplotlib.pyplot as plt
 import numpy as np