diff --git a/zarr-eio/test/dune b/zarr-eio/test/dune
index ea219fa..1d337e0 100644
--- a/zarr-eio/test/dune
+++ b/zarr-eio/test/dune
@@ -3,5 +3,6 @@
  (libraries
    zarr-eio
    ounit2)
+ (package zarr-eio)
  (preprocess
    (pps ppx_deriving.show)))
diff --git a/zarr-lwt/test/dune b/zarr-lwt/test/dune
index 0be4783..8911ba9 100644
--- a/zarr-lwt/test/dune
+++ b/zarr-lwt/test/dune
@@ -3,5 +3,6 @@
  (libraries
    zarr-lwt
    ounit2)
+ (package zarr-lwt)
  (preprocess
    (pps ppx_deriving.show)))
diff --git a/zarr-sync/test/dune b/zarr-sync/test/dune
index ca7eaf1..df5d268 100644
--- a/zarr-sync/test/dune
+++ b/zarr-sync/test/dune
@@ -3,5 +3,6 @@
  (libraries
    zarr-sync
    ounit2)
+ (package zarr-sync)
  (preprocess
    (pps ppx_deriving.show)))
diff --git a/zarr/test/dune b/zarr/test/dune
index fae4252..fca58e0 100644
--- a/zarr/test/dune
+++ b/zarr/test/dune
@@ -3,5 +3,6 @@
  (libraries
    zarr
    ounit2)
+ (package zarr)
  (preprocess
    (pps ppx_deriving.show)))