diff --git a/simple-mind-map/src/plugins/Formula.js b/simple-mind-map/src/plugins/Formula.js
index 8ac2da8c..af7e49fb 100644
--- a/simple-mind-map/src/plugins/Formula.js
+++ b/simple-mind-map/src/plugins/Formula.js
@@ -110,7 +110,7 @@ class Formula {
       for (const el of els)
         nodeText = nodeText.replace(
           el.outerHTML,
-          `\$${htmlEscape(el.getAttribute('data-value'))}\$`
+          `\$${el.getAttribute('data-value')}\$`
         )
     }
     return nodeText