diff --git a/Cargo.toml b/Cargo.toml
index a227dcb..e9351ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tun2proxy"
-version = "0.6.3"
+version = "0.6.4"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/tun2proxy/tun2proxy"
diff --git a/src/udpgw.rs b/src/udpgw.rs
index ae2cb87..baa7d36 100644
--- a/src/udpgw.rs
+++ b/src/udpgw.rs
@@ -218,7 +218,7 @@ impl StreamOperation for Packet {
 impl AsyncStreamOperation for Packet {
     async fn retrieve_from_async_stream<R>(r: &mut R) -> std::io::Result<Self>
     where
-        R: tokio::io::AsyncRead + Unpin + Send,
+        R: tokio::io::AsyncRead + Unpin + Send + ?Sized,
         Self: Sized,
     {
         let mut buf = [0; UDPGW_LENGTH_FIELD_SIZE];
@@ -277,7 +277,7 @@ impl StreamOperation for UdpgwHeader {
 impl AsyncStreamOperation for UdpgwHeader {
     async fn retrieve_from_async_stream<R>(r: &mut R) -> std::io::Result<Self>
     where
-        R: tokio::io::AsyncRead + Unpin + Send,
+        R: tokio::io::AsyncRead + Unpin + Send + ?Sized,
         Self: Sized,
     {
         let mut buf = [0; UdpgwHeader::static_len()];