diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php
index a651cbea77..20c495c182 100644
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -5394,7 +5394,7 @@ class wp_xmlrpc_server extends IXR_Server {
 
 		// Work around bug in strip_tags():
 		$linea = str_replace('<!DOC', '<DOC', $linea);
-		$linea = preg_replace( '/[\s\r\n\t]+/', ' ', $linea ); // normalize spaces
+		$linea = preg_replace( '/[\r\n\t ]+/', ' ', $linea ); // normalize spaces
 		$linea = preg_replace( "/<\/*(h1|h2|h3|h4|h5|h6|p|th|td|li|dt|dd|pre|caption|input|textarea|button|body)[^>]*>/", "\n\n", $linea );
 
 		preg_match('|<title>([^<]*?)</title>|is', $linea, $matchtitle);