Index: /trunk/src/org/openstreetmap/josm/tools/JosmDecimalFormatSymbolsProvider.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/tools/JosmDecimalFormatSymbolsProvider.java	(revision 16664)
+++ /trunk/src/org/openstreetmap/josm/tools/JosmDecimalFormatSymbolsProvider.java	(revision 16665)
@@ -29,5 +29,4 @@
     public Locale[] getAvailableLocales() {
         return Stream.of(
-                Stream.of(Locale.ROOT),
                 Stream.of("", "AU", "IE", "US", "UK").map(country -> new Locale("en", country, "")),
                 Stream.of("", "AT", "CH", "DE").map(country -> new Locale("de", country, "")),
Index: /trunk/test/unit/org/openstreetmap/josm/tools/JosmDecimalFormatSymbolsProviderTest.java
===================================================================
--- /trunk/test/unit/org/openstreetmap/josm/tools/JosmDecimalFormatSymbolsProviderTest.java	(revision 16664)
+++ /trunk/test/unit/org/openstreetmap/josm/tools/JosmDecimalFormatSymbolsProviderTest.java	(revision 16665)
@@ -29,5 +29,4 @@
     @Test
     public void testGroupingSeparator() {
-        checkGroupingSymbol(Locale.ROOT);
         assertTrue(I18n.getAvailableTranslations().count() > 10);
         I18n.getAvailableTranslations().forEach(this::checkGroupingSymbol);