diff --git a/pkgs/development/tools/librarian-puppet-go/default.nix b/pkgs/development/tools/librarian-puppet-go/default.nix
index 1e2a421a6702..8adea820ec76 100644
--- a/pkgs/development/tools/librarian-puppet-go/default.nix
+++ b/pkgs/development/tools/librarian-puppet-go/default.nix
@@ -18,7 +18,7 @@ buildGoPackage rec {
   meta = with lib; {
     inherit (src.meta) homepage;
     description = "librarian-puppet implementation in go.";
-    license = licenses.unfree; # still unspecified https://github.com/tmtk75/librarian-puppet-go/issues/5
+    license = licenses.mit;
     maintainers = with maintainers; [ womfoo ];
     platforms = [ "x86_64-linux" ];
   };