diff --git a/mobile/lib/utils/image_url_builder.dart b/mobile/lib/utils/image_url_builder.dart
index a4b7ee8f7d..b6c7f2ba8b 100644
--- a/mobile/lib/utils/image_url_builder.dart
+++ b/mobile/lib/utils/image_url_builder.dart
@@ -73,7 +73,7 @@ String getThumbnailUrlForRemoteId(
   final String id, {
   AssetMediaSize type = AssetMediaSize.thumbnail,
 }) {
-  return '${Store.get(StoreKey.serverEndpoint)}/assets/$id/thumbnail?format=${type.value}';
+  return '${Store.get(StoreKey.serverEndpoint)}/assets/$id/thumbnail?size=${type.value}';
 }
 
 String getFaceThumbnailUrl(final String personId) {