diff --git a/dune-project b/dune-project
index 5afd2f1..75ede85 100644
--- a/dune-project
+++ b/dune-project
@@ -11,6 +11,7 @@
  (name leaflet)
  (depends
   brr
+  js_of_ocaml
   (ocaml
    (>= 4.08))
   brr
diff --git a/example/dune b/example/dune
index 1b81cc6..b868e46 100644
--- a/example/dune
+++ b/example/dune
@@ -2,6 +2,4 @@
  (name main)
  (modules main)
  (libraries brr leaflet)
- (modes js)
- (preprocess
-  (pps js_of_ocaml-ppx)))
+ (modes js))
diff --git a/leaflet.opam b/leaflet.opam
index 3568ea2..de7dabf 100644
--- a/leaflet.opam
+++ b/leaflet.opam
@@ -17,6 +17,7 @@ bug-reports: "https://forge.kumikode.org/kumikode/leaflet/issues"
 depends: [
   "dune" {>= "2.9"}
   "brr"
+  "js_of_ocaml"
   "ocaml" {>= "4.08"}
   "brr"
   "js_of_ocaml"