diff --git a/app/serializers/rest/instance_serializer.rb b/app/serializers/rest/instance_serializer.rb
index 75d3acfea5..1900330475 100644
--- a/app/serializers/rest/instance_serializer.rb
+++ b/app/serializers/rest/instance_serializer.rb
@@ -71,6 +71,9 @@ class REST::InstanceSerializer < ActiveModel::Serializer
       accounts: {
         max_featured_tags: FeaturedTag::LIMIT,
         max_pinned_statuses: StatusPinValidator::PIN_LIMIT,
+        max_profile_fields: Account::DEFAULT_FIELDS_SIZE,
+        profile_field_name_limit: Account::Field::MAX_CHARACTERS_LOCAL,
+        profile_field_value_limit: Account::Field::MAX_CHARACTERS_LOCAL,
       },
 
       statuses: {