diff --git a/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java b/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java
--- a/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java
+++ b/src/org/openstreetmap/josm/plugins/slippymap/SlippyMapPreferences.java
@@ -171,7 +171,7 @@
         if (minZoomLvl == null || "".equals(minZoomLvl))
         {
         	minZoomLvl = "" + (SlippyMapPreferences.getMaxZoomLvl() - 4);
-            Main.pref.put(PREFERENCE_MAX_ZOOM_LVL, minZoomLvl);
+            Main.pref.put(PREFERENCE_MIN_ZOOM_LVL, minZoomLvl);
         }
 
         int navrat;