Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/BingAerialTileSource.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/BingAerialTileSource.java	(revision 33034)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/BingAerialTileSource.java	(revision 33079)
@@ -304,8 +304,8 @@
             int mask = 1 << (i - 1);
             if ((tilex & mask) != 0) {
-                digit += 1;
+                digit += (char) 1;
             }
             if ((tiley & mask) != 0) {
-                digit += 2;
+                digit += (char) 2;
             }
             k.append(digit);