diff --git a/wp-includes/feed-rdf.php b/wp-includes/feed-rdf.php
index 946f370a51..5a7b694492 100644
--- a/wp-includes/feed-rdf.php
+++ b/wp-includes/feed-rdf.php
@@ -25,7 +25,7 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date>
 	<?php the_generator( 'rdf' ); ?>
 	<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
-	<sy:updateFrequency>1</sy:updateFrequency>
+	<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
 	<sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase>
 	<?php do_action('rdf_header'); ?>
 	<items>