diff --git a/isso/tests/test_db.py b/isso/tests/test_db.py
index c5a62377..f753032f 100644
--- a/isso/tests/test_db.py
+++ b/isso/tests/test_db.py
@@ -267,7 +267,7 @@ def test_comment_text_not_null_migration_with_rollback_after_error(self):
         })
 
         try:
-            db = SQLite3(self.path, conf)
+            SQLite3(self.path, conf)
         except RuntimeError as e:
             self.assertEqual(str(e), "Migrating DB version 4 to 5 failed: no such column: notification")