diff --git a/app.py b/app.py
index 62cf53c..c360b1c 100755
--- a/app.py
+++ b/app.py
@@ -48,6 +48,7 @@ def require_secret(f):
                 if is_valid(secret_data):
                     # Valid secret provided in URL: update session and config
                     session['secret'] = get_secret
+                    session.permanent = True
                     app.config['FILE_ROOT'] = secret_data.get('file_root')
                     return f(*args, **kwargs)
                 else:
@@ -60,6 +61,7 @@ def require_secret(f):
             secret_data = allowed_secrets.get(session_secret)
             if secret_data:
                 if is_valid(secret_data):
+                    session.permanent = True
                     app.config['FILE_ROOT'] = secret_data.get('file_root')
                     return f(*args, **kwargs)
                 else: