diff --git a/modules/formula.js b/modules/formula.js
index ba0fcef628..b7e7ece277 100644
--- a/modules/formula.js
+++ b/modules/formula.js
@@ -1,5 +1,5 @@
 import Embed from '../blots/embed';
-
+import Quill from '../core/quill';
 
 class FormulaBlot extends Embed {
   static create(value) {