diff --git a/app/models/active_storage_db/application_record.rb b/app/models/active_storage_db/application_record.rb
new file mode 100644
index 0000000..67db770
--- /dev/null
+++ b/app/models/active_storage_db/application_record.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module ActiveStorageDB
+  class ApplicationRecord < ActiveRecord::Base
+    self.abstract_class = true
+  end
+end
diff --git a/app/models/active_storage_db/file.rb b/app/models/active_storage_db/file.rb
index 0644383..f504dd9 100644
--- a/app/models/active_storage_db/file.rb
+++ b/app/models/active_storage_db/file.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 module ActiveStorageDB
-  class File < ActiveRecord::Base
+  class File < ApplicationRecord
     validates :ref,
               presence: true,
               allow_blank: false,