diff --git a/src/lib_stdlib/tezos-stdlib.opam b/src/lib_stdlib/tezos-stdlib.opam
index 32f551109..c81efc3eb 100644
--- a/src/lib_stdlib/tezos-stdlib.opam
+++ b/src/lib_stdlib/tezos-stdlib.opam
@@ -14,6 +14,7 @@ depends: [
   "ocplib-endian"
   "stringext"
   "lwt"
+  "zarith"
   "alcotest" { test }
 ]
 build: [