Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/OsmTileSource.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/OsmTileSource.java	(revision 26085)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/OsmTileSource.java	(revision 26234)
@@ -9,4 +9,9 @@
         public Mapnik() {
             super("Mapnik", MAP_MAPNIK);
+        }
+
+        @Override
+        public int getMaxZoom() {
+            return 18;
         }