diff --git a/rpclib.opam b/rpclib.opam
index 7d31e60..df1da6d 100644
--- a/rpclib.opam
+++ b/rpclib.opam
@@ -14,6 +14,7 @@ depends: [
   "base64" {>= "3.4.0"}
   "cmdliner" {>= "0.9.8"}
   "rresult" {>= "0.3.0"}
+  "result" {>= "1.5"}
   "xmlm"
   "yojson" {>= "1.7.0"}
 ]