diff --git a/dicts/scripts/merge_giella_dicts.py b/dicts/scripts/merge_giella_dicts.py
index 2c0dfa85..adab0637 100644
--- a/dicts/scripts/merge_giella_dicts.py
+++ b/dicts/scripts/merge_giella_dicts.py
@@ -7,6 +7,7 @@
 
 This script can also be imported from python code, see the comment in the file.
 """
+import sys
 import xml.etree.ElementTree as ET
 from pathlib import Path