diff --git a/src/backend/impress/settings.py b/src/backend/impress/settings.py
index ab9c0b4d..5c1058b3 100755
--- a/src/backend/impress/settings.py
+++ b/src/backend/impress/settings.py
@@ -314,6 +314,7 @@ class Base(Configuration):
     # Easy thumbnails
     THUMBNAIL_EXTENSION = "webp"
     THUMBNAIL_TRANSPARENCY_EXTENSION = "webp"
+    THUMBNAIL_DEFAULT_STORAGE_ALIAS = "default"
     THUMBNAIL_ALIASES = {}
 
     # Celery