diff --git a/emm/src/main/java/whelk/Dump.java b/emm/src/main/java/whelk/Dump.java
index 0f135884de..70b2ea472e 100644
--- a/emm/src/main/java/whelk/Dump.java
+++ b/emm/src/main/java/whelk/Dump.java
@@ -210,6 +210,11 @@ private static void sendFormattedResponse(Whelk whelk, String apiBaseUrl, String
             responseObject.put("totalItems", totalEntityCount);
         }
 
+        var partOf = new LinkedHashMap<>();
+        partOf.put("type", "Collection");
+        partOf.put("id", apiBaseUrl + "?selection=" + dump);
+        responseObject.put("partOf", partOf);
+
         long nextOffset = offset + EmmChangeSet.TARGET_HITS_PER_PAGE;
         if (totalEntityCount == null || nextOffset < totalEntityCount) {
             responseObject.put("next", apiBaseUrl+"?selection="+dump+"&offset="+nextOffset);