diff --git a/pkgs/servers/nosql/riak/2.2.0.nix b/pkgs/servers/nosql/riak/2.2.0.nix
index b041aa9f35f..a09b4543cbb 100644
--- a/pkgs/servers/nosql/riak/2.2.0.nix
+++ b/pkgs/servers/nosql/riak/2.2.0.nix
@@ -92,5 +92,6 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ cstrahan mdaiter ];
     description = "Dynamo inspired NoSQL DB by Basho";
     platforms   = [ "x86_64-linux" ];
+    license     = licenses.asl20;
   };
 }