diff --git a/pkgs/applications/science/math/nauty/default.nix b/pkgs/applications/science/math/nauty/default.nix
index 76e7c796a13..94b7ad266c4 100644
--- a/pkgs/applications/science/math/nauty/default.nix
+++ b/pkgs/applications/science/math/nauty/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   version = "27r1";
   src = fetchurl {
     url = "http://pallini.di.uniroma1.it/nauty${version}.tar.gz";
-    sha256 = "1nym0p2djws8ylkpr0kgpxfa6fxdlh46cmvz0gn5vd02jzgs0aww";
+    sha256 = "0xsfqfcknbd6g6wzpa5l7crmmk3bf3zjh37rhylq6b20dqcmvjkn";
   };
   outputs = [ "out" "dev" ];
   configureFlags = [