diff --git a/crates/shadowsocks/src/net/sys/mod.rs b/crates/shadowsocks/src/net/sys/mod.rs
index 0944f8c785f1..c45bcd6eb7c8 100644
--- a/crates/shadowsocks/src/net/sys/mod.rs
+++ b/crates/shadowsocks/src/net/sys/mod.rs
@@ -151,16 +151,16 @@ static IP_STACK_CAPABILITIES: Lazy<IpStackCapabilities> = Lazy::new(|| {
     };
 
     // Check IPv4
-    if let Ok(_) = Socket::new(Domain::IPV4, Type::STREAM, Some(Protocol::TCP)) {
+    if Socket::new(Domain::IPV4, Type::STREAM, Some(Protocol::TCP)).is_ok() {
         caps.support_ipv4 = true;
         debug!("IpStackCapability support_ipv4=true");
     }
 
     // Check IPv6 (::1)
     if let Ok(ipv6_socket) = Socket::new(Domain::IPV6, Type::STREAM, Some(Protocol::TCP)) {
-        if let Ok(..) = ipv6_socket.set_only_v6(true) {
+        if ipv6_socket.set_only_v6(true).is_ok() {
             let local_host = SockAddr::from(SocketAddr::new(Ipv6Addr::LOCALHOST.into(), 0));
-            if let Ok(..) = ipv6_socket.bind(&local_host) {
+            if ipv6_socket.bind(&local_host).is_ok() {
                 caps.support_ipv6 = true;
                 debug!("IpStackCapability support_ipv6=true");
             }
@@ -168,7 +168,7 @@ static IP_STACK_CAPABILITIES: Lazy<IpStackCapabilities> = Lazy::new(|| {
     }
 
     // Check IPv4-mapped-IPv6 (127.0.0.1)
-    if let Ok(..) = check_ipv4_mapped_ipv6_capability() {
+    if check_ipv4_mapped_ipv6_capability().is_ok() {
         caps.support_ipv4_mapped_ipv6 = true;
         debug!("IpStackCapability support_ipv4_mapped_ipv6=true");
     }
@@ -192,7 +192,7 @@ fn check_ipv4_mapped_ipv6_capability() -> io::Result<()> {
                 return Err(io::Error::new(
                     ErrorKind::Other,
                     "local_addr shouldn't be an IPv4 address",
-                ))
+                ));
             }
             SocketAddr::V6(ref v6) => {
                 if let None = v6.ip().to_ipv4_mapped() {