diff --git a/actioncable/app/assets/javascripts/action_cable.coffee.erb b/actioncable/app/assets/javascripts/action_cable.coffee.erb
index d2dd8ce25f92e9ae110a5f413743e064008cefba..f0422d9d9ca01299b84dd6afe5480c94b48bb355 100644
--- a/actioncable/app/assets/javascripts/action_cable.coffee.erb
+++ b/actioncable/app/assets/javascripts/action_cable.coffee.erb
@@ -5,7 +5,7 @@
   INTERNAL: <%= ActionCable::INTERNAL.to_json %>
 
   createConsumer: (url) ->
-    url ?= @getConfig("url") ? "/cable"
+    url ?= @getConfig("url") ? @INTERNAL.default_mount_path
     new ActionCable.Consumer @createWebSocketURL(url)
 
   getConfig: (name) ->
diff --git a/actioncable/lib/action_cable.rb b/actioncable/lib/action_cable.rb
index a8e4d1cb2563cadd32e1f69f6aaa6ec5d76288d4..68a5fff3e75fabd5657153a5b9b3591b8aa7b2ed 100644
--- a/actioncable/lib/action_cable.rb
+++ b/actioncable/lib/action_cable.rb
@@ -34,7 +34,8 @@ module ActionCable
       ping: 'ping'.freeze,
       confirmation: 'confirm_subscription'.freeze,
       rejection: 'reject_subscription'.freeze
-    }
+    },
+    default_mount_path: '/cable'.freeze
   }
 
   # Singleton instance of the server
diff --git a/actioncable/lib/action_cable/engine.rb b/actioncable/lib/action_cable/engine.rb
index c90aadaf2cddfc21716594c9fbbe0751ffe5df07..7dc541d00c41a070f70f6989817ac9d1f993f86c 100644
--- a/actioncable/lib/action_cable/engine.rb
+++ b/actioncable/lib/action_cable/engine.rb
@@ -6,7 +6,7 @@
 module ActionCable
   class Railtie < Rails::Engine # :nodoc:
     config.action_cable = ActiveSupport::OrderedOptions.new
-    config.action_cable.mount_path = '/cable'
+    config.action_cable.mount_path = ActionCable::INTERNAL[:default_mount_path]
 
     config.eager_load_namespaces << ActionCable