diff --git a/listener/tproxy/udp.go b/listener/tproxy/udp.go
index f738ef0d..14205e4d 100644
--- a/listener/tproxy/udp.go
+++ b/listener/tproxy/udp.go
@@ -76,6 +76,7 @@ func NewUDP(addr string, tunnel C.Tunnel, additions ...inbound.Addition) (*UDPLi
 
 			rAddr, err := getOrigDst(oob[:oobn])
 			if err != nil {
+				pool.Put(buf)
 				continue
 			}