diff --git a/includes/apple-exporter/class-markdown.php b/includes/apple-exporter/class-markdown.php
index b91e5417..c5d0bb39 100644
--- a/includes/apple-exporter/class-markdown.php
+++ b/includes/apple-exporter/class-markdown.php
@@ -205,7 +205,7 @@ private function parse_node_list_item( $node ) {
 		if ( 'ol' === $this->list_mode ) {
 			return sprintf(
 				'%d. %s',
-				$this->list_index ++,
+				$this->list_index++,
 				$text
 			);
 		}