diff --git a/mantis/Database_generator.py b/mantis/Database_generator.py
index c9bc984..c4c51d1 100644
--- a/mantis/Database_generator.py
+++ b/mantis/Database_generator.py
@@ -187,7 +187,7 @@ def worker_setup_databases(self, queue, master_pid):
         while True:
             record = queue.pop(0)
             if record is None: break
-            if len(record) == 3:
+            if len(record) == 2:
                 database, stdout_path = record
                 taxon_id = None
             else: