diff --git a/test/blackbox-tests/test-cases/ocaml-syntax.t/run.t b/test/blackbox-tests/test-cases/ocaml-syntax.t/run.t
index cf9418044cef..bdf50d0ac0a9 100644
--- a/test/blackbox-tests/test-cases/ocaml-syntax.t/run.t
+++ b/test/blackbox-tests/test-cases/ocaml-syntax.t/run.t
@@ -1,2 +1,19 @@
   $ dune runtest --force
   ocaml syntax
+
+Check that (include ...) works when generated using OCaml syntax.
+
+  $ mkdir -p foo && cd foo
+  $ cat >dune-project <<EOF
+  > (lang dune 2.5)
+  > EOF
+  $ cat >dune <<EOF
+  > (* -*- tuareg -*- *)
+  > let () = Jbuild_plugin.V1.send {|(include dune.inc)|}
+  > EOF
+  $ cat >dune.inc <<EOF
+  > (rule (with-stdout-to foo.txt (echo Hola!)))
+  > EOF
+  $ dune build --root . ./foo.txt
+  $ cat _build/default/foo.txt
+  Hola!
diff --git a/test/blackbox-tests/test-cases/subdir-stanza.t/run.t b/test/blackbox-tests/test-cases/subdir-stanza.t/run.t
index f7e8f79b49c2..b7f41018f25a 100644
--- a/test/blackbox-tests/test-cases/subdir-stanza.t/run.t
+++ b/test/blackbox-tests/test-cases/subdir-stanza.t/run.t
@@ -72,3 +72,21 @@ In conjunction with dune generated files:
   $ dune build ./sub/bar
   $ cat _build/default/sub/bar
   parent
+
+subdir stanzas can also appear in included files
+
+  $ mkdir -p include/subdir; cd include
+  $ cat >dune-project <<EOF
+  > (lang dune 2.5)
+  > EOF
+  $ cat >dune <<EOF
+  > (include dune.inc)
+  > EOF
+  $ cat >dune.inc <<EOF
+  > (subdir subdir
+  >  (rule
+  >   (action (with-stdout-to hello.txt (echo "Hello from subdir\n")))))
+  > EOF
+  $ dune build --root . subdir/hello.txt
+  $ cat _build/default/subdir/hello.txt
+  Hello from subdir