diff --git a/src/HtmlUtils.js b/src/HtmlUtils.js
index 87e714083b..ccc7c1a630 100644
--- a/src/HtmlUtils.js
+++ b/src/HtmlUtils.js
@@ -393,7 +393,7 @@ export function bodyToHtml(content, highlights, opts) {
         }
         safeBody = sanitizeHtml(body, sanitizeHtmlParams);
         safeBody = unicodeToImage(safeBody);
-        safeBody = addCodeCopyButton(safeBody);
+        if (isHtml) safeBody = addCodeCopyButton(safeBody);
     }
     finally {
         delete sanitizeHtmlParams.textFilter;