diff --git a/builds/4chan-X.user.js b/builds/4chan-X.user.js
index a10fb32dd..16d56e31e 100644
--- a/builds/4chan-X.user.js
+++ b/builds/4chan-X.user.js
@@ -3889,7 +3889,7 @@
       return "/" + thread.board + "/ - " + excerpt;
     },
     threadFromRoot: function(root) {
-      return g.threads[$('.opcontainer', root).dataset.fullID];
+      return g.threads[$('.opContainer', root).dataset.fullID];
     },
     threadFromNode: function(node) {
       return Get.threadFromRoot($.x('ancestor::div[@class="thread"]', node));
diff --git a/builds/crx/script.js b/builds/crx/script.js
index fd0210058..1df2eef4b 100644
--- a/builds/crx/script.js
+++ b/builds/crx/script.js
@@ -3948,7 +3948,7 @@
       return "/" + thread.board + "/ - " + excerpt;
     },
     threadFromRoot: function(root) {
-      return g.threads[$('.opcontainer', root).dataset.fullID];
+      return g.threads[$('.opContainer', root).dataset.fullID];
     },
     threadFromNode: function(node) {
       return Get.threadFromRoot($.x('ancestor::div[@class="thread"]', node));
diff --git a/src/General/Get.coffee b/src/General/Get.coffee
index 006aab3f0..3e7367753 100755
--- a/src/General/Get.coffee
+++ b/src/General/Get.coffee
@@ -8,7 +8,7 @@ Get =
       excerpt = "#{excerpt[...67]}..."
     "/#{thread.board}/ - #{excerpt}"
   threadFromRoot: (root) ->
-    g.threads[$('.opcontainer', root).dataset.fullID]
+    g.threads[$('.opContainer', root).dataset.fullID]
   threadFromNode: (node) ->
     Get.threadFromRoot $.x 'ancestor::div[@class="thread"]', node
   postFromRoot: (root) ->