diff --git a/src/http.rs b/src/http.rs
index 8aabf2f..4d3e5bb 100644
--- a/src/http.rs
+++ b/src/http.rs
@@ -401,7 +401,7 @@ impl ConnectionManager for HttpManager {
         }
         Ok(Box::new(HttpConnection::new(
             info,
-            self.get_credentials().clone(),
+            self.credentials.clone(),
             self.digest_state.clone(),
         )?))
     }
@@ -409,10 +409,6 @@ impl ConnectionManager for HttpManager {
     fn get_server_addr(&self) -> SocketAddr {
         self.server
     }
-
-    fn get_credentials(&self) -> &Option<UserKey> {
-        &self.credentials
-    }
 }
 
 impl HttpManager {
diff --git a/src/socks.rs b/src/socks.rs
index 216dd48..7c62aa9 100644
--- a/src/socks.rs
+++ b/src/socks.rs
@@ -346,17 +346,13 @@ impl ConnectionManager for SocksProxyManager {
     fn new_proxy_handler(&self, info: &ConnectionInfo, udp_associate: bool) -> Result<Box<dyn ProxyHandler>> {
         use socks5_impl::protocol::Command::{Connect, UdpAssociate};
         let command = if udp_associate { UdpAssociate } else { Connect };
-        let credentials = self.get_credentials().clone();
+        let credentials = self.credentials.clone();
         Ok(Box::new(SocksProxyImpl::new(info, credentials, self.version, command)?))
     }
 
     fn get_server_addr(&self) -> SocketAddr {
         self.server
     }
-
-    fn get_credentials(&self) -> &Option<UserKey> {
-        &self.credentials
-    }
 }
 
 impl SocksProxyManager {
diff --git a/src/tun2proxy.rs b/src/tun2proxy.rs
index a8df375..a2629c1 100644
--- a/src/tun2proxy.rs
+++ b/src/tun2proxy.rs
@@ -18,7 +18,7 @@ use smoltcp::{
     time::Instant,
     wire::{IpCidr, IpProtocol, Ipv4Packet, Ipv6Packet, TcpPacket, UdpPacket, UDP_HEADER_LEN},
 };
-use socks5_impl::protocol::{Address, StreamOperation, UdpHeader, UserKey};
+use socks5_impl::protocol::{Address, StreamOperation, UdpHeader};
 use std::collections::LinkedList;
 #[cfg(target_family = "unix")]
 use std::os::unix::io::AsRawFd;
@@ -205,7 +205,6 @@ pub(crate) trait ProxyHandler {
 pub(crate) trait ConnectionManager {
     fn new_proxy_handler(&self, info: &ConnectionInfo, udp_associate: bool) -> Result<Box<dyn ProxyHandler>>;
     fn get_server_addr(&self) -> SocketAddr;
-    fn get_credentials(&self) -> &Option<UserKey>;
 }
 
 const TUN_TOKEN: Token = Token(0);