diff --git a/app/views/common/_discourse_javascript.html.erb b/app/views/common/_discourse_javascript.html.erb
index f753ff0f8..a9c1c38bd 100644
--- a/app/views/common/_discourse_javascript.html.erb
+++ b/app/views/common/_discourse_javascript.html.erb
@@ -31,7 +31,7 @@
 
 <script>
   Discourse.CDN = '<%= Rails.configuration.action_controller.asset_host %>';
-  Discourse.BaseUrl = '<%= RailsMultisite::ConnectionManagement.current_hostname %>';
+  Discourse.BaseUrl = '<%= RailsMultisite::ConnectionManagement.current_hostname %>'.replace(/:[\d]*$/,"");
   Discourse.BaseUri = '<%= Discourse::base_uri "/" %>';
   Discourse.Environment = '<%= Rails.env %>';
   Discourse.SiteSettings = PreloadStore.get('siteSettings');