diff --git a/packages/api/src/utils/highlightGenerator.ts b/packages/api/src/utils/highlightGenerator.ts
index 6af5cae16..2b472f8b6 100644
--- a/packages/api/src/utils/highlightGenerator.ts
+++ b/packages/api/src/utils/highlightGenerator.ts
@@ -74,7 +74,7 @@ function getTextNodesBetween(rootNode: Node, startNode: Node, endNode: Node) {
     }
 
     for (
-      var i = 0, len = node.childNodes.length;
+      let i = 0, len = node.childNodes.length;
       !reachedEndNode && i < len;
       ++i
     ) {