diff --git a/dspace-server-webapp/src/main/java/org/dspace/app/rest/converter/MockMetadataConverter.java b/dspace-server-webapp/src/main/java/org/dspace/app/rest/converter/MockMetadataConverter.java
index e662b48c91..88734825c6 100644
--- a/dspace-server-webapp/src/main/java/org/dspace/app/rest/converter/MockMetadataConverter.java
+++ b/dspace-server-webapp/src/main/java/org/dspace/app/rest/converter/MockMetadataConverter.java
@@ -7,13 +7,10 @@
  */
 package org.dspace.app.rest.converter;
 
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.SortedSet;
-import java.util.TreeSet;
 import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.StringUtils;