diff --git a/scripts/copy-button.js b/scripts/copy-button.js
index 0a709ca..bbf6f66 100644
--- a/scripts/copy-button.js
+++ b/scripts/copy-button.js
@@ -6,11 +6,11 @@
 */
 
 hexo.extend.filter.register('after_render:html', (data) => {
-  // Avoid duplicate button
-  if (data.includes('</button></td>')) return;
-
   const copyBtn = '<button class="copy-button">Copy</button>'
 
   // Regex is based on https://github.com/hexojs/hexo/pull/3697
-  return data.replace(/<td class="code">(?!<\/td>).+?<\/td>/, (str) => str.replace('</td>', copyBtn + '</td>'))
+  return data.replace(/<td class="code">(?!<\/td>).+?<\/td>/ig, (str) => {
+    if (!str.includes(copyBtn)) return str.replace('</td>', copyBtn + '</td>')
+    return str
+  })
 })