diff --git a/static/js/theme.js b/static/js/theme.js
index db1892e055..bfd1025403 100644
--- a/static/js/theme.js
+++ b/static/js/theme.js
@@ -594,7 +594,8 @@ function initCodeClipboard(){
         var text = getCodeText( code );
         var inPre = code.parentNode.tagName.toLowerCase() == 'pre';
         var inTable = inPre &&
-            code.parentNode.parentNode.tagName.toLowerCase() == 'td';
+            code.parentNode.parentNode.tagName.toLowerCase() == 'td' &&
+            code.parentNode.parentNode.classList.contains('lntd');
         // avoid copy-to-clipboard for highlight shortcode in table lineno mode
         var isFirstLineCell = inTable &&
             code.parentNode.parentNode.parentNode.querySelector( 'td:first-child > pre > code' ) == code;