diff --git a/pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.3.nix b/pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.3.nix
index 478dd68e8bbb..19ad49aa9280 100644
--- a/pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.3.nix
+++ b/pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.3.nix
@@ -5,7 +5,7 @@ import ./generic.nix {
   name = "docbook-xml-4.3";
   src = fetchurl {
     url = http://www.docbook.org/xml/4.3/docbook-xml-4.3.zip;
-    md5 = "ab200202b9e136a144db1e0864c45074";
+    sha256 = "0r1l2if1z4wm2v664sqdizm4gak6db1kx9y50jq89m3gxaa8l1i3";
   };
   meta = {
     branch = "4.3";