diff --git a/lib/jsonld_serializers.js b/lib/jsonld_serializers.js
index f0a24f5a..6e743478 100644
--- a/lib/jsonld_serializers.js
+++ b/lib/jsonld_serializers.js
@@ -395,8 +395,10 @@ class ItemResultsSerializer extends JsonLdListSerializer {
     return `resources:${result.uri}`
   }
 
-  static serialize (items, opts) {
-    const results = items.map((i) => ItemResourceSerializer.serialize(i))
+  static async serialize (items, opts) {
+    const results = await Promise.all(
+      items.map((i) => ItemResourceSerializer.serialize(i))
+    )
     return (new ItemResultsSerializer(results, opts)).format()
   }
 }