diff --git a/4chan_x.js b/4chan_x.js
index c67b91530..395284b9b 100644
--- a/4chan_x.js
+++ b/4chan_x.js
@@ -1144,7 +1144,7 @@
     dialog: function(link) {
       var MAX_FILE_SIZE, THREAD_ID, clone, dialog, el, html, mail, name, pass, spoiler;
       MAX_FILE_SIZE = $('input[name="MAX_FILE_SIZE"]').value;
-      THREAD_ID = g.THREAD_ID || link.pathname.split('/').pop();
+      THREAD_ID = g.THREAD_ID || $.x('preceding::div[@class="op"][1]', link).id;
       name = $('input[name=name]').value;
       mail = $('input[name=email]').value;
       pass = $('input[name=pwd]').value;
diff --git a/script.coffee b/script.coffee
index 5ab2639af..53ff64f8d 100644
--- a/script.coffee
+++ b/script.coffee
@@ -892,7 +892,7 @@ qr =
   dialog: (link) ->
     #maybe should be global
     MAX_FILE_SIZE = $('input[name="MAX_FILE_SIZE"]').value
-    THREAD_ID = g.THREAD_ID or link.pathname.split('/').pop()
+    THREAD_ID = g.THREAD_ID or $.x('preceding::div[@class="op"][1]', link).id
     name = $('input[name=name]').value
     mail = $('input[name=email]').value
     pass = $('input[name=pwd]').value