diff --git a/Fix-a-test-3247.patch b/Fix-a-test-3247.patch
new file mode 100644
index 0000000000000000000000000000000000000000..dba0604f57e47a62f28b6323f135407783e6eeb5
--- /dev/null
+++ b/Fix-a-test-3247.patch
@@ -0,0 +1,25 @@
+From be76d5018a92d975008e309d9db43c3ff719bb12 Mon Sep 17 00:00:00 2001
+From: Andrey Mokhov <amokhov@janestreet.com>
+Date: Fri, 6 Mar 2020 18:25:22 +0000
+Subject: [PATCH] Fix a test (#3247)
+
+Signed-off-by: Andrey Mokhov <amokhov@janestreet.com>
+---
+ test/blackbox-tests/test-cases/plugin-mode/run.t | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/test/blackbox-tests/test-cases/plugin-mode/run.t b/test/blackbox-tests/test-cases/plugin-mode/run.t
+index 85124cec9..25ffc7d48 100644
+--- a/test/blackbox-tests/test-cases/plugin-mode/run.t
++++ b/test/blackbox-tests/test-cases/plugin-mode/run.t
+@@ -147,6 +147,7 @@ Testsuite for (mode plugin).
+   6 |  (embed_in_plugin_libraries xxx))
+                                   ^^^
+   Error: Library "xxx" not found.
++  Hint: try: dune external-lib-deps --missing @all
+   [1]
+ 
+   $ cat > dune <<EOF
+-- 
+2.27.0
+
diff --git a/ocaml-dune.spec b/ocaml-dune.spec
index 707d2207dc86e6f3fb380ccce5badcdd33fbff10..5a79eed7977d794c72ba494d76e38d0434685186 100644
--- a/ocaml-dune.spec
+++ b/ocaml-dune.spec
@@ -6,7 +6,7 @@
 
 Name:           ocaml-%{libname}
 Version:        2.4.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A composable build system for OCaml
 
 # Dune itself is MIT.  Some bundled libraries have a different license:
@@ -21,6 +21,7 @@ License:        MIT and LGPLv2 and LGPLv2 with exceptions and ISC
 
 URL:            https://dune.build
 Source0:        https://github.com/ocaml/%{libname}/archive/%{version}/%{libname}-%{version}.tar.gz
+Patch0:         Fix-a-test-3247.patch
 
 BuildRequires:  emacs
 BuildRequires:  ocaml >= 4.07
@@ -188,5 +189,8 @@ cp -ar README.md CHANGES.md MIGRATION.md doc/_build/* %{buildroot}%{_pkgdocdir}/
 %{_emacs_sitelispdir}/dune*
 
 %changelog
+* Thu Dec 28 2023 fandehui <fandehui@xfusion.com> -2.4.0-2
+- Fix a test (#3247)
+
 * Thu Nov 12 2020 wanghongzhe<wanghongzhe@huawei.com> - 2.4.0-1
 - Package Init