diff --git a/lib/db/dune b/lib/db/dune
index 41f21b5..faf1f80 100644
--- a/lib/db/dune
+++ b/lib/db/dune
@@ -3,4 +3,4 @@
  (libraries std brr-lwd-ui.brrer yojson data_source worker_api)
  (flags :standard -open Ppx_yojson_conv_lib.Yojson_conv.Primitives)
  (preprocess
-  (pps ppx_yojson_conv)))
+  (pps ppx_yojson_conv ppx_deriving_jsont)))