Index: trunk/src/org/openstreetmap/josm/gui/preferences/MapPaintPreference.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/preferences/MapPaintPreference.java	(revision 3869)
+++ trunk/src/org/openstreetmap/josm/gui/preferences/MapPaintPreference.java	(revision 3870)
@@ -233,7 +233,5 @@
                 knownDefaults.add(def.url);
             }
-            if (Main.pref.putCollection("mappaint.style.known-defaults", knownDefaults)) {
-                changed = true;
-            }
+            Main.pref.putCollection("mappaint.style.known-defaults", knownDefaults);
 
             return changed;