diff --git a/pydoctor/astbuilder.py b/pydoctor/astbuilder.py
index 8fd7e7c5f..64e4d8879 100644
--- a/pydoctor/astbuilder.py
+++ b/pydoctor/astbuilder.py
@@ -3,7 +3,6 @@
 
 import ast
 from collections import defaultdict
-from statistics import mean 
 import sys
 
 from functools import partial