diff --git a/setup.py b/setup.py
index d772e5b5659acaf497b3ce27130984adae9321ad..f7a92f163dc01c5199c97e0d9afd93d3ef1330d0 100755
--- a/setup.py
+++ b/setup.py
@@ -11,6 +11,7 @@ setup(
     license='GNU AGPLv3+',
 
     install_requires=[
+        'babel>=2.6',  # Debian:python3-babel
         'beancount>=2.2',  # Debian:beancount
         'PyYAML>=3.0',  # Debian:python3-yaml
         'regex',  # Debian:python3-regex