diff --git a/test/unit/test_assembly.py b/test/unit/test_assembly.py
index 6453b95b..20584cb4 100644
--- a/test/unit/test_assembly.py
+++ b/test/unit/test_assembly.py
@@ -9,6 +9,7 @@
 import Bio.Data.IUPACData
 import unittest
 import argparse
+import csv
 import glob
 import os
 import os.path