diff --git a/lib/Text/Dokuwiki/Render/Markdown.pm b/lib/Text/Dokuwiki/Render/Markdown.pm
index 2ec9047..b2cc526 100644
--- a/lib/Text/Dokuwiki/Render/Markdown.pm
+++ b/lib/Text/Dokuwiki/Render/Markdown.pm
@@ -106,12 +106,6 @@ sub span {
   return $content;
 }
 
-sub sup {
-  my ($self, $attrs, $content) = @_;
-
-  return "<sup>" . $self->treewalk($content) . "</sup>";
-}
-
 sub blockquote {
   my ($self, $attrs, $content) = @_;