diff --git a/inc/config.php b/inc/config.php
index 7a2f603d..c55163ab 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -937,6 +937,9 @@
 	// Number of reports you can create at once.
 	$config['report_limit'] = 3;
 
+	// Maximum number of characters per report.
+	$config['report_max_length'] = 30;
+
 	// Allow unfiltered HTML in board subtitle. This is useful for placing icons and links.
 	$config['allow_subtitle_html'] = false;
 
@@ -1179,7 +1182,7 @@
 	$config['error']['toomanycross']	= _('Too many cross-board links; post discarded.');
 	$config['error']['nodelete']		= _('You didn\'t select anything to delete.');
 	$config['error']['noreport']		= _('You didn\'t select anything to report.');
-	$config['error']['invalidreport']	= _('The reason was too long.');
+	$config['error']['toolongreport']	= _('The reason was too long.');
 	$config['error']['toomanyreports']	= _('You can\'t report that many posts at once.');
 	$config['error']['invalidpassword']	= _('Wrong password…');
 	$config['error']['invalidimg']		= _('Invalid image.');
diff --git a/post.php b/post.php
index 86178cde..0d9baa07 100644
--- a/post.php
+++ b/post.php
@@ -488,6 +488,10 @@ if (isset($_POST['delete'])) {
 	$reason = escape_markup_modifiers($_POST['reason']);
 	markup($reason);
 
+	if (mb_strlen($reason) > $config['report_max_length']) {
+		error($config['error']['toolongreport']);
+	}
+
 	foreach ($report as &$id) {
 		$query = prepare(sprintf("SELECT `id`, `thread` FROM ``posts_%s`` WHERE `id` = :id", $board['uri']));
 		$query->bindValue(':id', $id, PDO::PARAM_INT);