diff --git a/pkgs/tools/security/thc-hydra/default.nix b/pkgs/tools/security/thc-hydra/default.nix
index 3a52b905024..8b65b27b66b 100644
--- a/pkgs/tools/security/thc-hydra/default.nix
+++ b/pkgs/tools/security/thc-hydra/default.nix
@@ -3,10 +3,11 @@
 with stdenv.lib;
 
 stdenv.mkDerivation rec {
-  name = "thc-hydra-7.5";
+  name = "thc-hydra-${version}";
+  version = "7.5";
 
   src = fetchurl {
-    url = "http://www.thc.org/releases/${name}.tar.gz";
+    url = "http://www.thc.org/releases/hydra-${version}.tar.gz";
     sha256 = "1dhavbn2mcm6c2c1qw29ipbpmczax3vhhlxzwn49c8cq471yg4vj";
   };