diff --git a/lib/jsonapi/active_model_error_serializer.rb b/lib/jsonapi/active_model_error_serializer.rb
index 59a3e3c..4676342 100644
--- a/lib/jsonapi/active_model_error_serializer.rb
+++ b/lib/jsonapi/active_model_error_serializer.rb
@@ -1,8 +1,14 @@
 require 'jsonapi/error_serializer'
+require 'jsonapi/deserialization'
 
 module JSONAPI
   # [ActiveModel::Errors] serializer
   class ActiveModelErrorSerializer < ErrorSerializer
+    extend ::JSONAPI::Deserialization
+
+    # Cleanups to DRY things...
+    singleton_class.undef_method :jsonapi_deserialize
+
     attribute :status do
       '422'
     end
@@ -45,6 +51,11 @@ class ActiveModelErrorSerializer < ErrorSerializer
       attrs = (model_serializer.attributes_to_serialize || {}).keys
       rels = (model_serializer.relationships_to_serialize || {}).keys
 
+      # Revert back to underscore any serializer transformation...
+      [attrs, rels].each do |skeys|
+        skeys.map! { |skey| jsonapi_inflector.underscore(skey) }
+      end
+
       if attrs.include?(error_key)
         { pointer: "/data/attributes/#{error_key}" }
       elsif rels.include?(error_key)