diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java b/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java
index 44018ec974418928525fd4d31739ab6b4d35e10e..3e7863a7362b572e065aab2ca1cab1c5a598a83e 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java
@@ -122,7 +122,7 @@ public class SetDeliverer {
     // Assemble DH ES request.
     else if (this.dariah) {
 
-      Script collectionID = new Script("doc['administrativeMetadata:dcterms:identifier'].value");
+      Script collectionID = new Script("doc['administrativeMetadata:dcterms:identifier']");
 
       AggregationBuilder filterCollections = AggregationBuilders.filter("collectionFilter",
           QueryBuilders.boolQuery().must(QueryBuilders.matchPhraseQuery(