diff --git a/ch/chproto/proto.go b/ch/chproto/proto.go
index 6783886..6cabd0f 100644
--- a/ch/chproto/proto.go
+++ b/ch/chproto/proto.go
@@ -10,11 +10,6 @@ const (
 	ClientKeepAlive    = 6
 )
 
-const (
-	CompressionDisabled = 0
-	CompressionEnabled  = 1
-)
-
 const (
 	ServerHello        = 0
 	ServerData         = 1