diff --git a/src/wp-admin/post.php b/src/wp-admin/post.php
index 01d703dd2d..0c38b5631e 100644
--- a/src/wp-admin/post.php
+++ b/src/wp-admin/post.php
@@ -95,7 +95,9 @@ if ( ! $sendback ||
 		$sendback = admin_url( 'upload.php' );
 	} else {
 		$sendback = admin_url( 'edit.php' );
-		$sendback .= ( ! empty( $post_type ) ) ? '?post_type=' . $post_type : '';
+		if ( ! empty( $post_type ) ) {
+			$sendback = add_query_arg( 'post_type', $post_type, $sendback );
+		}
 	}
 } else {
 	$sendback = remove_query_arg( array('trashed', 'untrashed', 'deleted', 'ids'), $sendback );