diff --git a/protos/message.proto b/protos/message.proto
index 21bee3c..faa5059 100644
--- a/protos/message.proto
+++ b/protos/message.proto
@@ -329,7 +329,6 @@ message CursorPosition {
 message Hash {
   string salt = 1;
   string challenge = 2;
-  bool support_controlling_salt = 3;
 }
 
 enum ClipboardFormat {