Index: wp-includes/feed.php
===================================================================
--- wp-includes/feed.php	(revision 23176)
+++ wp-includes/feed.php	(working copy)
@@ -540,6 +540,7 @@
 	$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );
 	do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
 	$feed->init();
+    $feed->set_output_encoding(get_option('blog_charset'));
 	$feed->handle_content_type();
 
 	if ( $feed->error() )