Index: /applications/editors/josm/plugins/imagery_offset_db/src/iodb/ImageryIdGenerator.java
===================================================================
--- /applications/editors/josm/plugins/imagery_offset_db/src/iodb/ImageryIdGenerator.java	(revision 30533)
+++ /applications/editors/josm/plugins/imagery_offset_db/src/iodb/ImageryIdGenerator.java	(revision 30534)
@@ -22,4 +22,7 @@
         if( ImageryType.SCANEX.equals(type) && url.toLowerCase().equals("irs") )
             return "scanex_irs";
+
+        if( ImageryType.TMS.equals(type) && url.toLowerCase().matches(".+tiles\\.mapbox\\.com/v[3-9]/openstreetmap\\.map.*") )
+            return "mapbox";
 
         boolean isWMS = ImageryType.WMS.equals(type);