diff --git a/src/lib_base/tezos-base.opam b/src/lib_base/tezos-base.opam
index bdccfdc07..19521a9be 100644
--- a/src/lib_base/tezos-base.opam
+++ b/src/lib_base/tezos-base.opam
@@ -15,6 +15,7 @@ depends: [
   "tezos-error-monad"
   "tezos-micheline"
   "tezos-rpc"
+  "tezos-protocol-environment-sigs"
   "calendar"
   "ezjsonm" { >= "0.5.0" }
   "ipaddr"