diff --git a/src/proto_alpha/lib_protocol/src/delegate_services.ml b/src/proto_alpha/lib_protocol/src/delegate_services.ml
index 72c8c1216..2b132a144 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_services.ml
+++ b/src/proto_alpha/lib_protocol/src/delegate_services.ml
@@ -343,7 +343,7 @@ module S = struct
       ~query: RPC_query.empty
       ~input: Data_encoding.empty
       ~output: frozen_balances_encoding
-      RPC_path.(open_root / "delegate" /: Ed25519.Public_key_hash.rpc_arg / "frozen_balances")
+      RPC_path.(open_root / "delegate" /: Signature.Public_key_hash.rpc_arg / "frozen_balances")
 end
 let () =
   let open Services_registration in
diff --git a/src/proto_alpha/lib_protocol/src/delegate_services.mli b/src/proto_alpha/lib_protocol/src/delegate_services.mli
index 54ef254e8..174e90e90 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_services.mli
+++ b/src/proto_alpha/lib_protocol/src/delegate_services.mli
@@ -9,7 +9,9 @@
 
 open Alpha_context
 
-val frozen_balances : 'a #RPC_context.simple -> 'a -> Ed25519.Public_key_hash.t ->
+val frozen_balances:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
   Delegate.frozen_balances shell_tzresult Lwt.t
 
 module Baker : sig
diff --git a/src/proto_alpha/lib_protocol/src/delegate_storage.mli b/src/proto_alpha/lib_protocol/src/delegate_storage.mli
index b9be3054c..02ca3f386 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_storage.mli
+++ b/src/proto_alpha/lib_protocol/src/delegate_storage.mli
@@ -98,7 +98,7 @@ type frozen_balances = {
 
 (** Returns the amount of frozen deposit, fees and rewards associated to a given key. *)
 val frozen_balances:
-  Raw_context.t -> Ed25519.Public_key_hash.t ->
+  Raw_context.t -> Signature.Public_key_hash.t ->
   frozen_balances tzresult Lwt.t
 
 (** Returns the full 'balance' of the implicit contract associated to