diff --git a/compiler/lib/dune b/compiler/lib/dune
index 768d293c15..07cc98ed02 100644
--- a/compiler/lib/dune
+++ b/compiler/lib/dune
@@ -3,8 +3,8 @@
  (public_name js_of_ocaml-compiler)
  (synopsis "Js_of_ocaml compiler library")
  (libraries
-  compiler-libs.common
-  compiler-libs.bytecomp
+  ocaml-compiler-libs.common
+  ocaml-compiler-libs.bytecomp
   menhirLib
   sedlex
   yojson)
diff --git a/compiler/lib/magic_number.ml b/compiler/lib/magic_number.ml
index 693430bc5e..3cff4be55b 100644
--- a/compiler/lib/magic_number.ml
+++ b/compiler/lib/magic_number.ml
@@ -64,22 +64,14 @@ let compare (p1, n1) (p2, n2) =
 
 let equal a b = compare a b = 0
 
-let v =
+let () =
   let current = Ocaml_version.current in
-  match current with
-  | 4 :: 13 :: _ -> 30
-  | 4 :: 14 :: _ -> 31
-  | 5 :: 00 :: _ -> 32
-  | 5 :: 01 :: _ -> 33
-  | 5 :: 02 :: _ -> 34
-  | 5 :: 03 :: _ -> 35
-  | 5 :: 04 :: _ -> 36
-  | _ ->
-      if Ocaml_version.compare current [ 4; 13 ] < 0
-      then failwith "OCaml version unsupported. Upgrade to OCaml 4.13 or newer."
-      else (
-        assert (Ocaml_version.compare current [ 5; 5 ] >= 0);
-        failwith "OCaml version unsupported. Upgrade js_of_ocaml.")
+  if Ocaml_version.compare current [ 4; 13 ] < 0
+  then failwith "OCaml version unsupported. Upgrade to OCaml 4.13 or newer."
+  else if Ocaml_version.compare current [ 5; 5 ] >= 0
+  then failwith "OCaml version unsupported. Upgrade js_of_ocaml."
+
+let v = snd (of_string Ocaml_common.Config.exec_magic_number)
 
 let current_exe = "Caml1999X", v
 
diff --git a/dune-project b/dune-project
index 676fe82cb9..45b9ce66de 100644
--- a/dune-project
+++ b/dune-project
@@ -21,6 +21,7 @@
   (num :with-test)
   (ppx_expect (and (>= v0.16.1) :with-test))
   (ppxlib (>= 0.35))
+  (ocaml-compiler-libs (>= v0.12.4))
   (re :with-test)
   (cmdliner (>= 1.1.0))
   (sedlex (>= 3.3))
diff --git a/js_of_ocaml-compiler.opam b/js_of_ocaml-compiler.opam
index 98e4e00b15..4d3cbdde9c 100644
--- a/js_of_ocaml-compiler.opam
+++ b/js_of_ocaml-compiler.opam
@@ -17,6 +17,7 @@ depends: [
   "num" {with-test}
   "ppx_expect" {>= "v0.16.1" & with-test}
   "ppxlib" {>= "0.35"}
+  "ocaml-compiler-libs" {>= "v0.12.4"}
   "re" {with-test}
   "cmdliner" {>= "1.1.0"}
   "sedlex" {>= "3.3"}