diff --git a/src/dune b/src/dune
index 069f8e17..27ee21cd 100644
--- a/src/dune
+++ b/src/dune
@@ -2,7 +2,7 @@
 (library
   (name tiny_httpd)
   (public_name tiny_httpd)
-  (libraries threads)
+  (libraries threads seq)
   (flags :standard -safe-string -warn-error -a+8)
   (wrapped false))
 
diff --git a/tiny_httpd.opam b/tiny_httpd.opam
index 631e5d79..d0ea743a 100644
--- a/tiny_httpd.opam
+++ b/tiny_httpd.opam
@@ -13,6 +13,7 @@ depends: [
   "dune" { >= "2.0" }
   "base-threads"
   "result"
+  "seq"
   "ocaml" { >= "4.04.0" }
   "odoc" {with-doc}
   "qtest" { >= "2.9" & with-test}