Index: applications/editors/josm/plugins/wikipedia/src/org/wikipedia/WikipediaApp.java
===================================================================
--- applications/editors/josm/plugins/wikipedia/src/org/wikipedia/WikipediaApp.java	(revision 31881)
+++ applications/editors/josm/plugins/wikipedia/src/org/wikipedia/WikipediaApp.java	(revision 31907)
@@ -128,5 +128,6 @@
                 final String requestBody = "articles=" + Utils.encodeUrl(Utils.join(",", articleNames));
                 try (final Scanner scanner = new Scanner(
-                        HttpClient.create(new URL(url), "PUT").setReasonForRequest("Wikipedia")
+                        HttpClient.create(new URL(url), "POST").setReasonForRequest("Wikipedia")
+                                .setHeader("Content-Type", "application/x-www-form-urlencoded")
                                 .setRequestBody(requestBody.getBytes(StandardCharsets.UTF_8))
                                 .connect().getContentReader())