diff --git a/extensions/lock/less/forum.less b/extensions/lock/less/forum.less
index e8a0866ad..6a838e500 100644
--- a/extensions/lock/less/forum.less
+++ b/extensions/lock/less/forum.less
@@ -1,7 +1,11 @@
+:root {
+  --lock-color: #888;
+}
+
 .DiscussionLockedPost {
   .EventPost-icon,
   .EventPost-info,
   .EventPost-info a {
-    color: #888;
+    color: var(--lock-color);
   }
 }