diff --git a/src/uucore/src/lib/features/proc_info.rs b/src/uucore/src/lib/features/proc_info.rs
index 7ea54a85a..3f5334d10 100644
--- a/src/uucore/src/lib/features/proc_info.rs
+++ b/src/uucore/src/lib/features/proc_info.rs
@@ -164,7 +164,7 @@ impl ProcessInformation {
         let pid = {
             value
                 .iter()
-                .last()
+                .next_back()
                 .ok_or(io::ErrorKind::Other)?
                 .to_str()
                 .ok_or(io::ErrorKind::InvalidData)?
diff --git a/src/uucore/src/lib/features/tty.rs b/src/uucore/src/lib/features/tty.rs
index 6854ba164..221ee442d 100644
--- a/src/uucore/src/lib/features/tty.rs
+++ b/src/uucore/src/lib/features/tty.rs
@@ -73,7 +73,7 @@ impl TryFrom<PathBuf> for Teletype {
         let f = |prefix: &str| {
             value
                 .iter()
-                .last()?
+                .next_back()?
                 .to_str()?
                 .strip_prefix(prefix)?
                 .parse::<u64>()