diff --git a/horizon/server/single.yml b/horizon/server/single.yml
index 2555a50..bd2ea7b 100644
--- a/horizon/server/single.yml
+++ b/horizon/server/single.yml
@@ -14,6 +14,7 @@
       plugin: {}
       session:
         engine: "cache"
+      images_upload_mode: ${_param:horizon_images_upload_mode}
   apache:
     server:
       modules: