Index: applications/editors/josm/plugins/slippymap/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java
===================================================================
--- applications/editors/josm/plugins/slippymap/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java	(revision 17410)
+++ applications/editors/josm/plugins/slippymap/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java	(revision 17433)
@@ -172,5 +172,5 @@
         {
         	minZoomLvl = "" + (SlippyMapPreferences.getMaxZoomLvl() - 4);
-            Main.pref.put(PREFERENCE_MAX_ZOOM_LVL, minZoomLvl);
+            Main.pref.put(PREFERENCE_MIN_ZOOM_LVL, minZoomLvl);
         }