diff --git a/photo21/settings.py b/photo21/settings.py
index f46c675..216bc96 100644
--- a/photo21/settings.py
+++ b/photo21/settings.py
@@ -45,6 +45,9 @@ ADMINS = [
 SESSION_COOKIE_SECURE = not DEBUG
 CSRF_COOKIE_SECURE = not DEBUG
 
+# Remember HTTPS for 24h
+SECURE_HSTS_SECONDS = 86400
+
 # Application definition
 
 INSTALLED_APPS = [