diff --git a/dune-project b/dune-project
index c05a4cca..5eaf279c 100644
--- a/dune-project
+++ b/dune-project
@@ -46,5 +46,6 @@
   (depends
     (tiny_httpd (= :version))
     (eio (and (>= 1.0) (< 2.0)))
+    base-unix
     (logs :with-test)
     (odoc :with-doc)))
diff --git a/src/eio/dune b/src/eio/dune
index fafdcaf3..11100ed1 100644
--- a/src/eio/dune
+++ b/src/eio/dune
@@ -3,4 +3,4 @@
  (public_name tiny_httpd_eio)
  (synopsis "An EIO-based backend for Tiny_httpd")
  (flags :standard -safe-string -warn-error -a+8)
- (libraries tiny_httpd eio eio_posix))
+ (libraries tiny_httpd eio eio.unix))
diff --git a/tiny_httpd_eio.opam b/tiny_httpd_eio.opam
index 15b2a090..51f27557 100644
--- a/tiny_httpd_eio.opam
+++ b/tiny_httpd_eio.opam
@@ -11,6 +11,7 @@ depends: [
   "dune" {>= "3.2"}
   "tiny_httpd" {= version}
   "eio" {>= "1.0" & < "2.0"}
+  "base-unix"
   "logs" {with-test}
   "odoc" {with-doc}
 ]