diff --git a/openflexure_microscope/plugins/default/scan/plugin.py b/openflexure_microscope/plugins/default/scan/plugin.py
index 06bb87a7..dbf37b0c 100644
--- a/openflexure_microscope/plugins/default/scan/plugin.py
+++ b/openflexure_microscope/plugins/default/scan/plugin.py
@@ -2,6 +2,7 @@ import time
 import numpy as np
 from typing import Tuple
 import uuid
+import itertools
 import logging
 
 from openflexure_microscope.camera.base import generate_basename