diff --git a/assets/js/cactus.js.tmpl b/assets/js/cactus.js.tmpl
index 2f34d98..5644015 100644
--- a/assets/js/cactus.js.tmpl
+++ b/assets/js/cactus.js.tmpl
@@ -3,5 +3,5 @@ initComments({
   defaultHomeserverUrl: "https://matrix.cactus.chat:8448",  // full url of the Matrix server to use as guest
   serverName: "cactus.chat",            // server name of the Matrix server w/ Cactus Appservice
   siteName: "{{ .Site.Params.comments.cactus }}",  // the name that you registered with the cactus appservice
-  commentSectionId: "{{ .Page.Permalink }}"  // unique ID for this comments section.
+  commentSectionId: "{{ .File.BaseFileName }}"  // unique ID for this comments section.
 })