diff --git a/transport/internet/internal/pool.go b/transport/internet/internal/pool.go
index 6d622fcb3..470caebfb 100644
--- a/transport/internet/internal/pool.go
+++ b/transport/internet/internal/pool.go
@@ -8,6 +8,10 @@ import (
 	"v2ray.com/core/common/signal"
 )
 
+type ConnectionRecyler interface {
+	Put(ConnectionId, net.Conn)
+}
+
 type ConnectionId struct {
 	Local      v2net.Address
 	Remote     v2net.Address