diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index f12e27388a..3a27a2b030 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -735,33 +735,6 @@ function trackback_url( $deprecated_echo = true ) {
 		return get_trackback_url();
 }
 
-/**
- * Generates and displays the RDF for the trackback information of current post.
- *
- * @since 0.71
- *
- * @param int $deprecated Not used (Was $timezone = 0)
- */
-function trackback_rdf($deprecated = '') {
-	if ( !empty( $deprecated ) )
-		_deprecated_argument( __FUNCTION__, '2.5' );
-
-	if (stripos($_SERVER['HTTP_USER_AGENT'], 'W3C_Validator') === false) {
-		echo '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-				xmlns:dc="http://purl.org/dc/elements/1.1/"
-				xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
-			<rdf:Description rdf:about="';
-		the_permalink();
-		echo '"'."\n";
-		echo '    dc:identifier="';
-		the_permalink();
-		echo '"'."\n";
-		echo '    dc:title="'.str_replace('--', '&#x2d;&#x2d;', wptexturize(strip_tags(get_the_title()))).'"'."\n";
-		echo '    trackback:ping="'.get_trackback_url().'"'." />\n";
-		echo '</rdf:RDF>';
-	}
-}
-
 /**
  * Whether the current post is open for comments.
  *
diff --git a/wp-includes/deprecated.php b/wp-includes/deprecated.php
index a4c3b9307a..146dbaa0f3 100644
--- a/wp-includes/deprecated.php
+++ b/wp-includes/deprecated.php
@@ -2500,3 +2500,16 @@ function funky_javascript_fix($text) {
 
 	return $text;
 }
+
+/**
+ * Generates and displays the RDF for the trackback information of current post.
+ *
+ * @since 0.71
+ * @deprecated 3.0.0
+ *
+ * @param int $deprecated Not used (Was $timezone = 0)
+ */
+function trackback_rdf($deprecated = '') {
+	_deprecated_function( __FUNCTION__, '3.0' );
+	return '';
+}