diff --git a/zdebug/zdebug.go b/zdebug/zdebug.go
index 50cf713a185fbefb4f391757a9f87d0d456a626b..b3fc3e1bc07ace9d22a24dc3ba36447b212d491c 100644
--- a/zdebug/zdebug.go
+++ b/zdebug/zdebug.go
@@ -8,20 +8,6 @@ import (
 	"time"
 )
 
-type Monitor struct {
-	Alloc     uint64 `json:",omitempty"`
-	HeapInuse uint64 `json:",omitempty"`
-	MaxAlloc  uint64 `json:",omitempty"`
-	MaxSys    uint64 `json:",omitempty"`
-
-	LiveObjects uint64 `json:",omitempty"`
-
-	NumGC        uint32 `json:",omitempty"`
-	NumGoroutine int    `json:",omitempty"`
-}
-
-const mb = 1024 * 1024
-
 func NewMonitor(secs int) {
 	go func() {
 		var rtm runtime.MemStats