diff --git a/codex-rs/windows-sandbox-rs/src/lib.rs b/codex-rs/windows-sandbox-rs/src/lib.rs
index 7379a4849b..78fe050faf 100644
--- a/codex-rs/windows-sandbox-rs/src/lib.rs
+++ b/codex-rs/windows-sandbox-rs/src/lib.rs
@@ -326,7 +326,7 @@ mod windows_impl {
                 0,
                 PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
                 inherit_list.as_mut_ptr() as *mut _ as *mut _,
-                (std::mem::size_of::<HANDLE>() * inherit_list.len()),
+                std::mem::size_of::<HANDLE>() * inherit_list.len(),
                 ptr::null_mut(),
                 ptr::null_mut(),
             )