Index: /trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java	(revision 18702)
+++ /trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java	(revision 18703)
@@ -550,4 +550,6 @@
         supportedMimeTypes.add("image/jpgpng");         // used by ESRI
         supportedMimeTypes.add("image/png8");           // used by geoserver
+        supportedMimeTypes.add("image/vnd.jpeg-png");   // used by geoserver
+        supportedMimeTypes.add("image/vnd.jpeg-png8");  // used by geoserver
         supportedMimeTypes.add("image/png; mode=8bit"); // used by MapServer
         if (supportedMimeTypes.contains("image/jpeg")) {