diff --git a/doc/stdenv.xml b/doc/stdenv.xml
index 3da3dd8df96e..2e88d6b41548 100644
--- a/doc/stdenv.xml
+++ b/doc/stdenv.xml
@@ -27,7 +27,7 @@ stdenv.mkDerivation {
   name = "libfoo-1.2.3";
   src = fetchurl {
     url = http://example.org/libfoo-1.2.3.tar.bz2;
-    md5 = "e1ec107956b6ddcb0b8b0679367e9ac9";
+    sha256 = "0x2g1jqygyr5wiwg4ma1nd7w4ydpy82z9gkcv8vh2v8dn3y58v5m";
   };
 }</programlisting>