diff --git a/pkgs/tools/compression/zsync/default.nix b/pkgs/tools/compression/zsync/default.nix
index b92112a4816e..0de21cb9c736 100644
--- a/pkgs/tools/compression/zsync/default.nix
+++ b/pkgs/tools/compression/zsync/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     homepage = "http://zsync.moria.org.uk/";
     description = "File distribution system using the rsync algorithm";
-    license = licenses.free;
+    license = licenses.artistic2;
     maintainers = with maintainers; [ viric ];
     platforms = with platforms; all;
   };