Index: applications/editors/josm/plugins/reverter/src/reverter/ChangesetReverter.java
===================================================================
--- applications/editors/josm/plugins/reverter/src/reverter/ChangesetReverter.java	(revision 36319)
+++ applications/editors/josm/plugins/reverter/src/reverter/ChangesetReverter.java	(revision 36320)
@@ -16,4 +16,5 @@
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -474,5 +475,5 @@
      * @param toDelete The primitives that will be deleted
      */
-    private void checkObjectVersions(List<Command> cmds, HashSet<OsmPrimitive> conflicted, HashSet<OsmPrimitive> toDelete) {
+    private void checkObjectVersions(List<Command> cmds, Set<OsmPrimitive> conflicted, Set<OsmPrimitive> toDelete) {
         for (Iterator<ChangesetDataSetEntry> it = cds.iterator(); it.hasNext();) {
             ChangesetDataSetEntry entry = it.next();
@@ -518,5 +519,5 @@
      * @return {@code true} if the objects are not semantically the same
      */
-    private boolean checkObjectVersionsNotSemanticallySame(HashSet<OsmPrimitive> toDelete, HistoryOsmPrimitive hp, OsmPrimitive dp) {
+    private boolean checkObjectVersionsNotSemanticallySame(Set<OsmPrimitive> toDelete, HistoryOsmPrimitive hp, OsmPrimitive dp) {
         return hp.getVersion() != dp.getVersion()
                 && (hp.isVisible() || dp.isVisible()) &&
@@ -535,5 +536,5 @@
      * @param toDelete The primitives that will be deleted
      */
-    private void checkForDeletedReferrers(List<Command> cmds, HashSet<OsmPrimitive> conflicted, HashSet<OsmPrimitive> toDelete) {
+    private void checkForDeletedReferrers(List<Command> cmds, Set<OsmPrimitive> conflicted, Set<OsmPrimitive> toDelete) {
         List<OsmPrimitive> delSorted = toDelete.stream()
                 .filter(p -> !p.isDeleted())
@@ -565,6 +566,6 @@
      * @return {@code true} if we need to restart processing
      */
-    private boolean checkForDeletedReferrersPrimitive(List<Command> cmds, HashSet<OsmPrimitive> conflicted,
-                                                      HashSet<OsmPrimitive> toDelete, List<OsmPrimitive> delSorted,
+    private boolean checkForDeletedReferrersPrimitive(List<Command> cmds, Set<OsmPrimitive> conflicted,
+                                                      Set<OsmPrimitive> toDelete, List<OsmPrimitive> delSorted,
                                                       OsmPrimitive p, int i) {
         for (OsmPrimitive referrer : p.getReferrers()) {