diff --git a/didjvu/cli.py b/didjvu/cli.py
index 3e63951..9b9514e 100644
--- a/didjvu/cli.py
+++ b/didjvu/cli.py
@@ -19,7 +19,7 @@
 
 import argparse
 import functools
-from typing import Any, Callable, Dict, Generator, List, Optional, Type, Union
+from typing import Any, Callable, Dict, Generator, List, Optional, Tuple, Type, Union
 
 from didjvu import djvu_support
 from didjvu import version