diff --git a/ihatemoney/run.py b/ihatemoney/run.py
index 161761c0..a97737ed 100644
--- a/ihatemoney/run.py
+++ b/ihatemoney/run.py
@@ -146,6 +146,11 @@ def create_app(
     app.jinja_env.globals["static_include"] = static_include
     app.jinja_env.globals["locale_from_iso"] = locale_from_iso
     app.jinja_env.filters["minimal_round"] = minimal_round
+    
+    # Set session to permanent to make language choice persist
+    @app.before_request
+    def make_session_permanent():
+        session.permanent = True
 
     # Translations
     babel = Babel(app)