diff --git a/codex-rs/linux-sandbox/src/dns_routing.rs b/codex-rs/linux-sandbox/src/dns_routing.rs
index 0a0da59ab6..1470734f87 100644
--- a/codex-rs/linux-sandbox/src/dns_routing.rs
+++ b/codex-rs/linux-sandbox/src/dns_routing.rs
@@ -13,7 +13,7 @@ use url::Url;
 
 const SANDBOX_DNS_LISTEN_ADDR: (Ipv4Addr, u16) = (Ipv4Addr::LOCALHOST, 53);
 const DNS_IO_TIMEOUT: Duration = Duration::from_secs(3);
-const MAX_DNS_MESSAGE_BYTES: usize = usize::from(u16::MAX);
+const MAX_DNS_MESSAGE_BYTES: usize = u16::MAX as usize;
 
 pub(crate) struct BoundDnsStub {
     udp_socket: UdpSocket,
diff --git a/codex-rs/network-proxy/src/proxy.rs b/codex-rs/network-proxy/src/proxy.rs
index ee32cdb463..6be2362ed4 100644
--- a/codex-rs/network-proxy/src/proxy.rs
+++ b/codex-rs/network-proxy/src/proxy.rs
@@ -1302,7 +1302,8 @@ mod tests {
         }));
         let proxy = NetworkProxy::builder().state(state).build().await?;
 
-        let prepared = proxy.prepare_for_optional_environment(HashMap::new(), None)?;
+        let prepared =
+            proxy.prepare_for_optional_environment(HashMap::new(), /*environment_id*/ None)?;
 
         assert_eq!(proxy.dns_addr, None);
         assert_eq!(prepared.env.get(DNS_PROXY_ENV_KEY), None);