diff --git a/crates/shadowsocks/src/dns_resolver/resolver.rs b/crates/shadowsocks/src/dns_resolver/resolver.rs
index bd0c4661..620e55b8 100644
--- a/crates/shadowsocks/src/dns_resolver/resolver.rs
+++ b/crates/shadowsocks/src/dns_resolver/resolver.rs
@@ -196,7 +196,7 @@ async fn trust_dns_notify_update_dns(resolver: Arc<TrustDnsSystemResolver>) -> n
                 // Update once for all those Modify events
                 time::sleep(Duration::from_secs(1)).await;
 
-                match create_resolver(None, resolver.dns_cache_size.clone(), resolver.connect_opts.clone()).await {
+                match create_resolver(None, resolver.dns_cache_size, resolver.connect_opts.clone()).await {
                     Ok(r) => {
                         debug!("auto-reload {DNS_RESOLV_FILE_PATH}");
 
@@ -230,7 +230,7 @@ impl DnsResolver {
     pub async fn trust_dns_system_resolver(dns_cache_size: Option<usize>, connect_opts: ConnectOpts) -> io::Result<DnsResolver> {
         use super::trust_dns_resolver::create_resolver;
 
-        let resolver = create_resolver(None, dns_cache_size.clone(), connect_opts.clone()).await?;
+        let resolver = create_resolver(None, dns_cache_size, connect_opts.clone()).await?;
 
         let inner = Arc::new(TrustDnsSystemResolver {
             resolver: ArcSwap::from(Arc::new(resolver)),
diff --git a/crates/shadowsocks/src/dns_resolver/trust_dns_resolver.rs b/crates/shadowsocks/src/dns_resolver/trust_dns_resolver.rs
index eb1ff81c..eb5ad474 100644
--- a/crates/shadowsocks/src/dns_resolver/trust_dns_resolver.rs
+++ b/crates/shadowsocks/src/dns_resolver/trust_dns_resolver.rs
@@ -108,10 +108,7 @@ pub async fn create_resolver(dns: Option<ResolverConfig>, dns_cache_size: Option
             // Since we want to use Happy Eyeballs to connect to both IPv4 and IPv6 addresses, we need both A and AAAA records.
             resolver_opts.ip_strategy = LookupIpStrategy::Ipv4AndIpv6;
 
-            match dns_cache_size {
-                Some(size) => resolver_opts.cache_size = size,
-                None => {},
-            }
+            if let Some(size) = dns_cache_size { resolver_opts.cache_size = size }
 
             trace!(
                 "initializing DNS resolver with config {:?} opts {:?}",