diff --git a/geoportal/vars.yaml b/geoportal/vars.yaml
index a3d45d5d9..958853f2c 100644
--- a/geoportal/vars.yaml
+++ b/geoportal/vars.yaml
@@ -529,8 +529,8 @@ runtime_environment:
   - {name: PDS_SMTP_SERVER}
   - {name: PDS_BCC_ADDRESS}
   - {name: PROXYWMSURL, default: 'https://wmsproxy.geoportail.lu/ogcproxywms'}
-  - {name: UPLOAD_VT_STYLE_URL}
-  - {name: DELETE_VT_STYLE_URL}
+  - {name: UPLOAD_VT_STYLE_URL, default: ''}
+  - {name: DELETE_VT_STYLE_URL, default: ''}
   - {name: REVERSE_GEOCODE_API_KEY, default: ''}
   - {name: REVERSE_GEOCODE_URL, default: 'http://open.mapquestapi.com/nominatim/v1/reverse.php'}
   - {name: ROUTING_GRAPHHOPPER_API_KEY, default: null}