diff --git a/libmat2/office.py b/libmat2/office.py
index 0d0c795..5165056 100644
--- a/libmat2/office.py
+++ b/libmat2/office.py
@@ -6,9 +6,9 @@ import datetime
 import zipfile
 from typing import Dict, Set, Pattern
 try:  # protect against DoS
-    from defusedxml import ElementTree as ET
+    from defusedxml import ElementTree as ET  # type: ignore
 except ImportError:
-    import xml.etree.ElementTree as ET
+    import xml.etree.ElementTree as ET  # type: ignore
 
 
 from . import abstract, parser_factory