diff --git a/app/javascript/mastodon/features/compose/components/compose_form.js b/app/javascript/mastodon/features/compose/components/compose_form.js
index 2b9da20d7..69925bdae 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.js
+++ b/app/javascript/mastodon/features/compose/components/compose_form.js
@@ -86,7 +86,7 @@ class ComposeForm extends ImmutablePureComponent {
const { isSubmitting, isChangingUpload, isUploading, anyMedia } = this.props;
const fulltext = [this.props.spoilerText, countableText(this.props.text)].join('');
- if (isSubmitting || isUploading || isChangingUpload || length(fulltext) > 500 || (fulltext.length !== 0 && fulltext.trim().length === 0 && !anyMedia)) {
+ if (isSubmitting || isUploading || isChangingUpload || length(fulltext) > 512 || (fulltext.length !== 0 && fulltext.trim().length === 0 && !anyMedia)) {
return;
}
@@ -162,7 +162,7 @@ class ComposeForm extends ImmutablePureComponent {
const { intl, onPaste, showSearch, anyMedia } = this.props;
const disabled = this.props.isSubmitting;
const text = [this.props.spoilerText, countableText(this.props.text)].join('');
- const disabledButton = disabled || this.props.isUploading || this.props.isChangingUpload || length(text) > 500 || (text.length !== 0 && text.trim().length === 0 && !anyMedia);
+ const disabledButton = disabled || this.props.isUploading || this.props.isChangingUpload || length(text) > 512 || (text.length !== 0 && text.trim().length === 0 && !anyMedia);
let publishText = '';
if (this.props.privacy === 'private' || this.props.privacy === 'direct') {
@@ -215,7 +215,7 @@ class ComposeForm extends ImmutablePureComponent {