diff --git a/proto/mediums/multiplex_frames.proto b/proto/mediums/multiplex_frames.proto
index 7df3a2fe..5eb09b15 100644
--- a/proto/mediums/multiplex_frames.proto
+++ b/proto/mediums/multiplex_frames.proto
@@ -38,8 +38,7 @@ message MultiplexFrame {
 }
 
 message MultiplexFrameHeader {
-  optional bytes salted_service_id_hash = 1;
-  optional string service_id_hash_salt = 2;
+  optional bytes service_id_hash = 1;
 }
 
 // The control frame to establish, accept, reject or disconnect the virtual