diff --git a/example/mu/example.dtx b/example/mu/example.dtx
index da3e67bfd94d6b06da6245454fcfc96e71d83d71..3b24448d3552149cea93ffcc0c065dd85202869c 100644
--- a/example/mu/example.dtx
+++ b/example/mu/example.dtx
@@ -631,7 +631,7 @@ WĂĽnsch mir GlĂĽck!
 %<*pdftex>
 \shorthandoff{-}
 %</pdftex>
-\begin{markdown}[
+\begin{markdown}[%
   definitionLists,
   notes,
   inlineNotes,