diff --git a/src/wp-includes/post-template.php b/src/wp-includes/post-template.php
index b811174de9..3caeb29eb2 100644
--- a/src/wp-includes/post-template.php
+++ b/src/wp-includes/post-template.php
@@ -458,7 +458,8 @@ function get_body_class( $class = '' ) {
 	} elseif ( is_archive() ) {
 		if ( is_post_type_archive() ) {
 			$classes[] = 'post-type-archive';
-			$classes[] = 'post-type-archive-' . sanitize_html_class( get_query_var( 'post_type' ) );
+			foreach ( (array) get_query_var( 'post_type' ) as $post_type )
+				$classes[] = 'post-type-archive-' . sanitize_html_class( $post_type );
 		} else if ( is_author() ) {
 			$author = $wp_query->get_queried_object();
 			$classes[] = 'author';