Index: trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java	(revision 6867)
+++ trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java	(revision 6868)
@@ -39,5 +39,5 @@
      * @since 6867
      */
-    public static final String MAPCSS_STYLE_MIME_TYPES = "text/mapcss, text/css; q=0.9, text/plain; q=0.8, application/zip, application/octet-stream; q=0.5";
+    public static final String MAPCSS_STYLE_MIME_TYPES = "text/x-mapcss, text/mapcss, text/css; q=0.9, text/plain; q=0.8, application/zip, application/octet-stream; q=0.5";
 
     public final List<MapCSSRule> rules;