diff --git a/tests/e2e_pty.rs b/tests/e2e_pty.rs
index 391b765..1bf9a8e 100644
--- a/tests/e2e_pty.rs
+++ b/tests/e2e_pty.rs
@@ -233,14 +233,13 @@ impl PtyApp {
         self.send(b"\r");
     }
 
-    fn pid(&self) -> Option<u32> {
-        self.child.process_id()
-    }
-
-    /// Resident set size of the child in KiB (Linux only).
+    /// Resident set size of the child in KiB (Linux only). `process_id`
+    /// is read inline here rather than via a helper so the method has no
+    /// non-Linux callers to go dead (the CI clippy gate runs on Linux,
+    /// where such dead code wouldn't surface).
     #[cfg(target_os = "linux")]
     fn rss_kib(&self) -> Option<u64> {
-        let pid = self.pid()?;
+        let pid = self.child.process_id()?;
         let status = std::fs::read_to_string(format!("/proc/{pid}/status")).ok()?;
         status.lines().find_map(|l| {
             let rest = l.strip_prefix("VmRSS:")?;