diff --git a/src/pages/Main.vue b/src/pages/Main.vue
index 8c12d0e..9c39aa2 100644
--- a/src/pages/Main.vue
+++ b/src/pages/Main.vue
@@ -126,7 +126,7 @@ function entityToViewerItem(entity: EntityObject): ViewerItem {
   return {
     id: String(entity.identifier ?? ''),
     title: entity.properties.label ?? String(entity.identifier ?? ''),
-    mime: entity.properties.mime ?? '',
+    mime: 'image/webp',
     meta: { collection: entity.collection ? String(entity.collection) : null },
   }
 }