diff --git a/app/helpers/cable_helper.rb b/app/helpers/cable_helper.rb
new file mode 100644
index 0000000..e715806
--- /dev/null
+++ b/app/helpers/cable_helper.rb
@@ -0,0 +1,7 @@
+module CableHelper
+  def script_aware_action_cable_meta_tag
+    tag.meta \
+      name: "action-cable-url",
+      content: "#{request.script_name}#{ActionCable.server.config.mount_path}"
+  end
+end
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index fc9db75..00f7e5b 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -12,6 +12,7 @@
     <%= csrf_meta_tags %>
     <%= csp_meta_tag %>
     <%= current_user_meta_tags %>
+    <%= script_aware_action_cable_meta_tag %>
 
     <%= tag.meta name: "vapid-public-key", content: Rails.configuration.x.vapid.public_key %>
     <%= tag.meta name: "turbo-prefetch", content: "true" %>