diff --git a/app/javascript/textarea-initializer.js b/app/javascript/textarea-initializer.js
index 1b72b076e79..f957a1cc95e 100644
--- a/app/javascript/textarea-initializer.js
+++ b/app/javascript/textarea-initializer.js
@@ -58,7 +58,7 @@ export default class {
         csrfToken: CSRF.getToken(),
         placeholder: '%filenameをアップロード中...',
         uploadImageTag:
-          '<img src=%url width="%width" height="%height" loading="lazy" decoding="async" alt="%filename">\n',
+          '<img src="%url" width="%width" height="%height" loading="lazy" decoding="async" alt="%filename">\n',
         afterPreview: () => {
           autosize.update(textarea)