diff --git a/adapter/outbound/snell.go b/adapter/outbound/snell.go
index 92343055..7b272d5d 100644
--- a/adapter/outbound/snell.go
+++ b/adapter/outbound/snell.go
@@ -99,7 +99,13 @@ func (s *Snell) ListenPacketContext(ctx context.Context, metadata *C.Metadata, o
 	tcpKeepAlive(c)
 	c = streamConn(c, streamOption{s.psk, s.version, s.addr, s.obfsOption})
 
-	return s.ListenPacketOnStreamConn(c, metadata)
+	err = snell.WriteUDPHeader(c, s.version)
+	if err != nil {
+		return nil, err
+	}
+
+	pc := snell.PacketConn(c)
+	return newPacketConn(pc, s), nil
 }
 
 // ListenPacketOnStreamConn implements C.ProxyAdapter
diff --git a/adapter/outbound/trojan.go b/adapter/outbound/trojan.go
index 46586673..31811c51 100644
--- a/adapter/outbound/trojan.go
+++ b/adapter/outbound/trojan.go
@@ -161,7 +161,13 @@ func (t *Trojan) ListenPacketContext(ctx context.Context, metadata *C.Metadata,
 		}
 	}
 
-	return t.ListenPacketOnStreamConn(c, metadata)
+	err = t.instance.WriteHeader(c, trojan.CommandUDP, serializesSocksAddr(metadata))
+	if err != nil {
+		return nil, err
+	}
+
+	pc := t.instance.PacketConn(c)
+	return newPacketConn(pc, t), err
 }
 
 // ListenPacketOnStreamConn implements C.ProxyAdapter