diff --git a/roles/nuancier/templates/nuancier-lite.cfg b/roles/nuancier/templates/nuancier-lite.cfg
index d372cd570d..6ed97d6aeb 100644
--- a/roles/nuancier/templates/nuancier-lite.cfg
+++ b/roles/nuancier/templates/nuancier-lite.cfg
@@ -42,3 +42,5 @@ CACHE_FOLDER = os.path.join(STATIC_FOLDER, 'cache')
 ### The application will keep the ratio intact and just make sure that either
 ### length or width of the picture fit the length and width specified below.
 THUMB_SIZE = (256, 256)
+
+PREFERRED_URL_SCHEME='https'