diff --git a/app/javascript/mastodon/features/compose/containers/compose_form_container.js b/app/javascript/mastodon/features/compose/containers/compose_form_container.js
index bda2edba6..8bc4018d7 100644
--- a/app/javascript/mastodon/features/compose/containers/compose_form_container.js
+++ b/app/javascript/mastodon/features/compose/containers/compose_form_container.js
@@ -28,7 +28,7 @@ const mapStateToProps = state => ({
   anyMedia: state.getIn(['compose', 'media_attachments']).size > 0,
   isInReply: state.getIn(['compose', 'in_reply_to']) !== null,
   lang: state.getIn(['compose', 'language']),
-  maxChars: state.getIn(['server', 'server', 'configuration', 'statuses', 'max_characters'], 500),
+  maxChars: state.getIn(['server', 'server', 'configuration', 'statuses', 'max_characters'], 100500),
 });
 
 const mapDispatchToProps = (dispatch) => ({
diff --git a/app/validators/status_length_validator.rb b/app/validators/status_length_validator.rb
index dc841ded3..734ab143b 100644
--- a/app/validators/status_length_validator.rb
+++ b/app/validators/status_length_validator.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class StatusLengthValidator < ActiveModel::Validator
-  MAX_CHARS = 500
+  MAX_CHARS = 100500
   URL_PLACEHOLDER_CHARS = 23
   URL_PLACEHOLDER = 'x' * 23