diff --git a/dns-client.opam b/dns-client.opam
index c9731ff1..ecdc770e 100644
--- a/dns-client.opam
+++ b/dns-client.opam
@@ -19,6 +19,7 @@ depends: [
   "randomconv" {>= "0.1.2"}
   "domain-name" {>= "0.4.0"}
   "mtime" {>= "1.2.0"}
+  "mirage-crypto-rng" {>= "0.11.0"}
   "alcotest" {with-test}
 ]
 synopsis: "DNS client API"