diff --git a/app/channels/activity_notification/notification_api_channel.rb b/app/channels/activity_notification/notification_api_channel.rb
index ce2eca61..8d209e78 100644
--- a/app/channels/activity_notification/notification_api_channel.rb
+++ b/app/channels/activity_notification/notification_api_channel.rb
@@ -1,8 +1,8 @@
-if defined?(ActionCable)
-  # Action Cable API channel to subscribe broadcasted notifications.
-  class ActivityNotification::NotificationApiChannel < ActivityNotification::NotificationChannel
-    # ActionCable::Channel::Base#subscribed
-    # @see https://api.rubyonrails.org/classes/ActionCable/Channel/Base.html#method-i-subscribed
+# Action Cable API channel to subscribe broadcasted notifications.
+class ActivityNotification::NotificationApiChannel < ActivityNotification::NotificationChannel
+  if defined?(ActionCable)
+  # ActionCable::Channel::Base#subscribed
+  # @see https://api.rubyonrails.org/classes/ActionCable/Channel/Base.html#method-i-subscribed
     def subscribed
       stream_from "#{ActivityNotification.config.notification_api_channel_prefix}_#{@target.to_class_name}#{ActivityNotification.config.composite_key_delimiter}#{@target.id}"
     rescue
diff --git a/app/channels/activity_notification/notification_api_with_devise_channel.rb b/app/channels/activity_notification/notification_api_with_devise_channel.rb
index 759c8a44..1a4fde17 100644
--- a/app/channels/activity_notification/notification_api_with_devise_channel.rb
+++ b/app/channels/activity_notification/notification_api_with_devise_channel.rb
@@ -1,6 +1,6 @@
-if defined?(ActionCable)
-  # Action Cable API channel to subscribe broadcasted notifications with Devise authentication.
-  class ActivityNotification::NotificationApiWithDeviseChannel < ActivityNotification::NotificationApiChannel
+# Action Cable API channel to subscribe broadcasted notifications with Devise authentication.
+class ActivityNotification::NotificationApiWithDeviseChannel < ActivityNotification::NotificationApiChannel
+  if defined?(ActionCable)
     # Include PolymorphicHelpers to resolve string extentions
     include ActivityNotification::PolymorphicHelpers
 
diff --git a/app/channels/activity_notification/notification_channel.rb b/app/channels/activity_notification/notification_channel.rb
index 40f5d2ea..c26a3190 100644
--- a/app/channels/activity_notification/notification_channel.rb
+++ b/app/channels/activity_notification/notification_channel.rb
@@ -34,4 +34,6 @@ def authenticate_target!
         reject if @target.nil? || @target.notification_action_cable_with_devise?
       end
   end
+else
+  class ActivityNotification::NotificationChannel; end
 end
diff --git a/app/channels/activity_notification/notification_with_devise_channel.rb b/app/channels/activity_notification/notification_with_devise_channel.rb
index 2c4b8d3e..c8967c01 100644
--- a/app/channels/activity_notification/notification_with_devise_channel.rb
+++ b/app/channels/activity_notification/notification_with_devise_channel.rb
@@ -1,6 +1,6 @@
-if defined?(ActionCable)
-  # Action Cable channel to subscribe broadcasted notifications with Devise authentication.
-  class ActivityNotification::NotificationWithDeviseChannel < ActivityNotification::NotificationChannel
+# Action Cable channel to subscribe broadcasted notifications with Devise authentication.
+class ActivityNotification::NotificationWithDeviseChannel < ActivityNotification::NotificationChannel
+  if defined?(ActionCable)
     # Include PolymorphicHelpers to resolve string extentions
     include ActivityNotification::PolymorphicHelpers