diff --git a/app/javascript/mastodon/features/compose/components/compose_form.jsx b/app/javascript/mastodon/features/compose/components/compose_form.jsx
index 991ea33d9..936a34f05 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.jsx
+++ b/app/javascript/mastodon/features/compose/components/compose_form.jsx
@@ -104,7 +104,7 @@ class ComposeForm extends ImmutablePureComponent {
   };
 
   canSubmit = () => {
-    const { isSubmitting, isChangingUpload, isUploading, anyMedia } = this.props;
+    const { isSubmitting, isChangingUpload, isUploading, anyMedia, maxChars } = this.props;
     const fulltext = this.getFulltextForCharacterCounting();
     const isOnlyWhitespace = fulltext.length !== 0 && fulltext.trim().length === 0;