Index: trunk/src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java	(revision 15368)
+++ trunk/src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java	(revision 15369)
@@ -53,5 +53,5 @@
     protected static final ListProperty IGNORED_KEYS = new ListProperty(
             "overlapping-ways.ignored-keys", Arrays.asList(
-                    "barrier", "building", "building:part", "historic:building", "demolished:building",
+                    "barrier", "indoor", "building", "building:part", "historic:building", "demolished:building",
                     "removed:building", "disused:building", "abandoned:building", "proposed:building", "man_made"));
     protected static final Predicate<OsmPrimitive> IGNORED = primitive ->