Index: trunk/src/org/openstreetmap/josm/data/osm/AbstractPrimitive.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/osm/AbstractPrimitive.java	(revision 11939)
+++ trunk/src/org/openstreetmap/josm/data/osm/AbstractPrimitive.java	(revision 11940)
@@ -344,5 +344,5 @@
             flags |= flag;
         } else {
-            flags &= ~flag;
+            flags &= (short) ~flag;
         }
     }