diff --git a/crispio/map.py b/crispio/map.py
index 8e5d368..bb9f465 100644
--- a/crispio/map.py
+++ b/crispio/map.py
@@ -7,7 +7,6 @@
 
 from bioino import FastaSequence, GffFile, GffLine
 from carabiner import pprint_dict
-from carabiner.cast import cast
 from nemony import encode, hash as nm_hash
 from streq import find_iupac, reverse_complement, which_re_sites
 from tqdm.auto import tqdm