Index: applications/editors/josm/plugins/slippymap/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapLayer.java
===================================================================
--- applications/editors/josm/plugins/slippymap/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapLayer.java	(revision 17433)
+++ applications/editors/josm/plugins/slippymap/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapLayer.java	(revision 17822)
@@ -73,5 +73,5 @@
     public SlippyMapLayer() {
         super(tr("Slippy Map"));
-        background = true;
+        setBackgroundLayer(true);
 
         clearTileStorage();