diff --git a/IkiWiki/Plugin/comments.pm b/IkiWiki/Plugin/comments.pm
index d1105b366..4fa82f467 100644
--- a/IkiWiki/Plugin/comments.pm
+++ b/IkiWiki/Plugin/comments.pm
@@ -302,7 +302,7 @@ sub sessioncgi ($$) { #{{{
 
 	my $type = $form->param('type');
 	if (defined $type && length $type && $IkiWiki::hooks{htmlize}{$type}) {
-		$type = possibly_foolish_untaint($type);
+		$type = IkiWiki::possibly_foolish_untaint($type);
 	}
 	else {
 		$type = $config{default_pageext};