diff --git a/src/index.ts b/src/index.ts
index 696eb5b..ab5f887 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1316,7 +1316,7 @@ export default class PluginFootnote extends Plugin {
             Array.from(footnoteIds).map(async footnoteId => {
                 let footnoteBlock = (await getBlockDOM(footnoteId)).dom;
                 if (footnoteBlock) {
-                    footnoteBlock = footnoteBlock.replace(/(<span data-type=".*?custom-footnote-index[^>]*>)\[\d+\](<\/span>)/g, '$1${this.i18n.indexAnchor}$2');
+                    footnoteBlock = footnoteBlock.replace(/(<span data-type=".*?custom-footnote-index[^>]*>)\[\d+\](<\/span>)/g, `$1${this.i18n.indexAnchor}$2`);
                 }
                 updateBlock("dom", footnoteBlock, footnoteId);
                 // return setBlockAttrs(footnoteId, { "name": "" });