diff --git a/hobo/hobofields/lib/hobo_fields.rb b/hobo/hobofields/lib/hobo_fields.rb
index 4b4edf7..225d8ed 100644
--- a/hobo/hobofields/lib/hobo_fields.rb
+++ b/hobo/hobofields/lib/hobo_fields.rb
@@ -73,7 +73,9 @@ module HoboFields
     return false if val.blank? && (col_type == :integer || col_type == :float || col_type == :decimal)
     klass = Object.instance_method(:class).bind(val).call # Make sure we get the *real* class
     arity = type.instance_method(:initialize).arity
-    (arity == 1 || arity == -1) && !@never_wrap_types.any? { |c| klass <= c }
+    (arity == 1 || arity == -1) &&
+      type.instance_method(:initialize).owner != Object.instance_method(:initialize).owner &&
+      !@never_wrap_types.any? { |c| klass <= c }
   end