diff --git a/pkgs/development/libraries/botan/generic.nix b/pkgs/development/libraries/botan/generic.nix
index 791731ec856..8d68009390d 100644
--- a/pkgs/development/libraries/botan/generic.nix
+++ b/pkgs/development/libraries/botan/generic.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     name = "Botan-${version}.tgz";
-    url = "http://files.randombit.net/botan/v${baseVersion}/Botan-${version}.tbz";
+    url = "http://files.randombit.net/botan/v${baseVersion}/Botan-${version}.tgz";
     inherit sha256;
   };