Index: src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java
===================================================================
--- src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java	(revision 14778)
+++ src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java	(working copy)
@@ -51,7 +51,7 @@
 
     protected static final ListProperty IGNORED_KEYS = new ListProperty(
             "overlapping-ways.ignored-keys", Arrays.asList(
-                    "barrier", "building", "building:part", "historic:building", "demolished:building",
+                    "barrier", "building", "building:part", "boundary", "historic:building", "demolished:building",
                     "removed:building", "disused:building", "abandoned:building", "proposed:building", "man_made"));
 
     /** Constructor */