Index: applications/editors/josm/plugins/wikipedia/src/org/wikipedia/WikipediaApp.java
===================================================================
--- applications/editors/josm/plugins/wikipedia/src/org/wikipedia/WikipediaApp.java	(revision 29217)
+++ applications/editors/josm/plugins/wikipedia/src/org/wikipedia/WikipediaApp.java	(revision 29218)
@@ -165,5 +165,5 @@
                     "?action=query" +
                     "&prop=langlinks" +
-                    "&titles=" + article +
+                    "&titles=" + URLEncoder.encode(article, "UTF-8") +
                     "&lllimit=500" +
                     "&format=xml";