diff --git a/wsapi.go b/wsapi.go
index d0a89e9..9dff232 100644
--- a/wsapi.go
+++ b/wsapi.go
@@ -261,7 +261,6 @@ type heartbeatOp struct {
 
 type helloOp struct {
 	HeartbeatInterval time.Duration `json:"heartbeat_interval"`
-	Trace             []string      `json:"_trace"`
 }
 
 // FailedHeartbeatAcks is the Number of heartbeat intervals to wait until forcing a connection restart.