diff --git a/src/models/node.js b/src/models/node.js
index b93efac1c..e75c0c012 100644
--- a/src/models/node.js
+++ b/src/models/node.js
@@ -904,7 +904,8 @@ const Node = {
     return this
       .getCharactersAtRange(range)
       .reduce((memo, char) => {
-        return memo.concat(char.marks.toArray())
+        char.marks.toArray().forEach(c => memo.push(c))
+        return memo
       }, [])
   },