diff --git a/co/component.py b/co/component.py
index a1ace70..0591939 100644
--- a/co/component.py
+++ b/co/component.py
@@ -2,7 +2,6 @@
 from functools import reduce
 import logging
 
-from Bio import Alphabet
 from Bio.Seq import Seq
 import operator
 from Bio.SeqFeature import FeatureLocation, SeqFeature