diff --git a/pkgs/data/sgml+xml/schemas/xml-dtd/docbook-ebnf/default.nix b/pkgs/data/sgml+xml/schemas/xml-dtd/docbook-ebnf/default.nix
index 0df76cd28761..e9ff03f78435 100644
--- a/pkgs/data/sgml+xml/schemas/xml-dtd/docbook-ebnf/default.nix
+++ b/pkgs/data/sgml+xml/schemas/xml-dtd/docbook-ebnf/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation {
   builder = ./builder.sh;
   dtd = fetchurl {
     url = http://www.docbook.org/xml/ebnf/1.2b1/dbebnf.dtd;
-    md5 = "e50f7d38caf4285965c7a247e026fa7c";
+    sha256 = "0min5dsc53my13b94g2yd65q1nkjcf4x1dak00bsc4ckf86mrx95";
   };
   catalog = ./docbook-ebnf.cat;