diff --git a/config/config.exs b/config/config.exs
index f0b6b0363..118f697b3 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -257,8 +257,8 @@ config :pleroma, :instance,
   user_name_length: 100,
   max_account_fields: 10,
   max_remote_account_fields: 20,
-  account_field_name_length: 255,
-  account_field_value_length: 255,
+  account_field_name_length: 512,
+  account_field_value_length: 512,
   external_user_synchronization: true
 
 config :pleroma, :markup,
diff --git a/docs/config.md b/docs/config.md
index ec3035c22..c246e2f6c 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -134,8 +134,8 @@ config :pleroma, Pleroma.Emails.Mailer,
 * `dynamic_configuration`: Allow transferring configuration to DB with the subsequent customization from Admin api.
 * `max_account_fields`: The maximum number of custom fields in the user profile (default: `10`)
 * `max_remote_account_fields`: The maximum number of custom fields in the remote user profile (default: `20`)
-* `account_field_name_length`: An account field name maximum length (default: `255`)
-* `account_field_value_length`: An account field value maximum length (default: `255`)
+* `account_field_name_length`: An account field name maximum length (default: `512`)
+* `account_field_value_length`: An account field value maximum length (default: `512`)
 * `external_user_synchronization`: Enabling following/followers counters synchronization for external users.