Index: applications/editors/josm/plugins/lakewalker/src/org/openstreetmap/josm/plugins/lakewalker/LakewalkerPreferences.java
===================================================================
--- applications/editors/josm/plugins/lakewalker/src/org/openstreetmap/josm/plugins/lakewalker/LakewalkerPreferences.java	(revision 12479)
+++ applications/editors/josm/plugins/lakewalker/src/org/openstreetmap/josm/plugins/lakewalker/LakewalkerPreferences.java	(revision 12588)
@@ -132,5 +132,5 @@
    * Save entered preference values on OK button
    */
-  public void ok() {
+  public boolean ok() {
     Main.pref.put(PREF_MAX_SEG, maxSegsConfig.getValueString());
     Main.pref.put(PREF_MAX_NODES, maxNodesConfig.getValueString());
@@ -146,5 +146,5 @@
     Main.pref.put(PREF_MAXCACHESIZE, maxCacheSizeConfig.getValueString());
     Main.pref.put(PREF_MAXCACHEAGE, maxCacheAgeConfig.getValueString());
+    return false;
   }
-  
 }