diff --git a/wp-includes/canonical.php b/wp-includes/canonical.php
index 82ee38718a..e9d8448348 100644
--- a/wp-includes/canonical.php
+++ b/wp-includes/canonical.php
@@ -337,7 +337,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		$redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&');
 
 		// Redirect obsolete feeds
-		$redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$3', $redirect['query'] );
+		$redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$2', $redirect['query'] );
 
 		// Remove redundant leading ampersands
 		$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );