diff --git a/app/models/ext_management_system.rb b/app/models/ext_management_system.rb
index 3d52177f429..7e407760304 100644
--- a/app/models/ext_management_system.rb
+++ b/app/models/ext_management_system.rb
@@ -27,6 +27,10 @@ def self.supported_types_and_descriptions_hash
     end
   end
 
+  def self.api_allowed_attributes
+    %w[]
+  end
+
   belongs_to :provider
   has_many :child_managers, :class_name => 'ExtManagementSystem', :foreign_key => 'parent_ems_id'
 
diff --git a/app/models/provider.rb b/app/models/provider.rb
index 0715e447018..d7d855e4594 100644
--- a/app/models/provider.rb
+++ b/app/models/provider.rb
@@ -34,6 +34,10 @@ def self.short_token
     parent.name.demodulize
   end
 
+  def self.api_allowed_attributes
+    %w[]
+  end
+
   def image_name
     self.class.short_token.underscore
   end