diff --git a/corneto/backend/_base.py b/corneto/backend/_base.py
index 573bf42e..462267d9 100644
--- a/corneto/backend/_base.py
+++ b/corneto/backend/_base.py
@@ -1,5 +1,4 @@
 import abc
-from turtle import pos
 import numpy as np
 import numbers
 from typing import Set, Any, Dict, Iterable, Optional, Tuple, Union, List