diff --git a/src/main/java/edu/harvard/iq/dataverse/util/json/JsonPrinter.java b/src/main/java/edu/harvard/iq/dataverse/util/json/JsonPrinter.java
index c72dfc1d127..904f12cf9ab 100644
--- a/src/main/java/edu/harvard/iq/dataverse/util/json/JsonPrinter.java
+++ b/src/main/java/edu/harvard/iq/dataverse/util/json/JsonPrinter.java
@@ -639,7 +639,8 @@ public static JsonObjectBuilder json(MetadataBlock metadataBlock, boolean printO
         jsonObjectBuilder.add("displayOnCreate", metadataBlock.isDisplayOnCreate());
 
         JsonObjectBuilder fieldsBuilder = Json.createObjectBuilder();
-        Set<DatasetFieldType> datasetFieldTypes = new TreeSet<>(metadataBlock.getDatasetFieldTypes());
+        List<DatasetFieldType>fieldTypes = metadataBlock.getDatasetFieldTypes();
+        Set<DatasetFieldType> datasetFieldTypes = new TreeSet<>(fieldTypes);
 
         for (DatasetFieldType datasetFieldType : datasetFieldTypes) {
             Long datasetFieldTypeId = datasetFieldType.getId();