diff --git a/doc/manual/writing-nix-expressions.xml b/doc/manual/writing-nix-expressions.xml
index 99d766872..b11f6debe 100644
--- a/doc/manual/writing-nix-expressions.xml
+++ b/doc/manual/writing-nix-expressions.xml
@@ -576,7 +576,7 @@ builder becomes even shorter:
 
 <programlisting>
 . $stdenv/setup
-genericBuilder></programlisting>
+genericBuilder</programlisting>
 
 In fact, <varname>mkDerivation</varname> provides a default builder
 that looks exactly like that, so it is actually possible to omit the