1 files changed, 1 insertions, 0 deletions
diff --git a/flake.nix b/flake.nix
index caa29fae..68378954 100644
--- a/flake.nix
+++ b/flake.nix
@@ -80,6 +80,7 @@
           OCAMLPARAM = "_,warn-error=+A"; # Turn all warnings into errors.
           propagatedBuildInputs = (with ocamlPackages; [
             core_unix
+            ppx_deriving
           ]);
         };