diff --git a/test/blackbox-tests/test-cases/ocamllex-jbuild/bar.mll b/test/blackbox-tests/test-cases/ocamllex-jbuild/bar.mll
new file mode 100644
index 00000000..97715204
--- /dev/null
+++ b/test/blackbox-tests/test-cases/ocamllex-jbuild/bar.mll
@@ -0,0 +1,8 @@
+{}
+
+rule f = parse
+  | _ { () }
+
+{
+  print_endline "bar"
+}
diff --git a/test/blackbox-tests/test-cases/ocamllex-jbuild/jbuild b/test/blackbox-tests/test-cases/ocamllex-jbuild/jbuild
index 172cb590..999f215c 100644
--- a/test/blackbox-tests/test-cases/ocamllex-jbuild/jbuild
+++ b/test/blackbox-tests/test-cases/ocamllex-jbuild/jbuild
@@ -1,5 +1,7 @@
 (ocamllex
  ((modules (foo))))
 
+(ocamllex (bar))
+
 (executable
  ((name foo)))