diff --git a/lib_test/dune b/lib_test/dune
index 9db3212..9a05659 100644
--- a/lib_test/dune
+++ b/lib_test/dune
@@ -5,6 +5,7 @@
 
 (alias
  (name runtest)
+ (package protocol-9p-unix)
  (deps
   (:< lofs_test.exe)
   tests.exe)
diff --git a/protocol-9p-unix.opam b/protocol-9p-unix.opam
index bea3a3e..deba49a 100644
--- a/protocol-9p-unix.opam
+++ b/protocol-9p-unix.opam
@@ -31,6 +31,7 @@ depends: [
 build: [
   ["dune" "subst"] {pinned}
   ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
 ]
 dev-repo: "git+https://github.com/mirage/ocaml-9p.git"
 synopsis: "A Unix implementation of the 9p protocol in pure OCaml"