Index: trunk/src/org/openstreetmap/josm/actions/mapmode/DeleteAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/mapmode/DeleteAction.java	(revision 16660)
+++ trunk/src/org/openstreetmap/josm/actions/mapmode/DeleteAction.java	(revision 16661)
@@ -439,5 +439,5 @@
     }
 
-    private boolean changesHiddenWay(Command c) {
+    private static boolean changesHiddenWay(Command c) {
         return c.getParticipatingPrimitives().stream().anyMatch(OsmPrimitive::isDisabledAndHidden);
     }