Index: /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/UnclosedWays.java
===================================================================
--- /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/UnclosedWays.java	(revision 18788)
+++ /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/UnclosedWays.java	(revision 18789)
@@ -73,5 +73,5 @@
 
         test = w.get("natural");
-        if (test != null && !"coastline".equals(test))
+        if (test != null && !"coastline".equals(test) && !"cliff".equals(test))
             set(1101, marktr("natural type {0}"), test);
         test = w.get("landuse");