diff --git a/includes/class-syndication-wp-xmlrpc-client.php b/includes/class-syndication-wp-xmlrpc-client.php
index 85a1aa62cde175b3394f853bfc5b93acb254c295..bbd8322a6050f8cc9abe7a4894ff03523dccaaf9 100644
--- a/includes/class-syndication-wp-xmlrpc-client.php
+++ b/includes/class-syndication-wp-xmlrpc-client.php
@@ -221,7 +221,7 @@ class Syndication_WP_XMLRPC_Client extends WP_HTTP_IXR_Client implements Syndica
 	}
 
 	private function _get_meta_blacklist() {
-		return apply_filters( 'syn_ignored_meta_fields', array( '_edit_last', '_edit_lock', /** TODO: add more **/ ) );
+		return apply_filters( 'syn_ignored_meta_fields', array( '_edit_last', '_edit_lock', '_thumbnail_id' /** TODO: add more **/ ) );
 	}
 
 	private function _get_post_terms( $post_id ) {