diff --git a/src/du/du.rs b/src/du/du.rs
index ad2b5df25..08d0fff5b 100644
--- a/src/du/du.rs
+++ b/src/du/du.rs
@@ -14,8 +14,6 @@ extern crate time;
 #[macro_use]
 extern crate uucore;
 
-// XXX: remove when we no longer support 1.22.0
-use std::ascii::AsciiExt;
 use std::collections::HashSet;
 use std::env;
 use std::fs;
diff --git a/src/hashsum/hashsum.rs b/src/hashsum/hashsum.rs
index e71ed4f4e..e953939e4 100644
--- a/src/hashsum/hashsum.rs
+++ b/src/hashsum/hashsum.rs
@@ -32,8 +32,6 @@ use regex::Regex;
 use sha1::Sha1;
 use sha2::{Sha224, Sha256, Sha384, Sha512};
 use sha3::{Sha3_224, Sha3_256, Sha3_384, Sha3_512, Shake128, Shake256};
-#[allow(unused_imports)]
-use std::ascii::AsciiExt;
 use std::fs::File;
 use std::io::{self, stdin, BufRead, BufReader, Read};
 use std::path::Path;
diff --git a/src/pinky/pinky.rs b/src/pinky/pinky.rs
index e36d05f63..8e23986c6 100644
--- a/src/pinky/pinky.rs
+++ b/src/pinky/pinky.rs
@@ -164,8 +164,6 @@ pub trait Capitalize {
 
 impl Capitalize for str {
     fn capitalize(&self) -> String {
-        #[allow(unused_imports)]
-        use std::ascii::AsciiExt;
         self.char_indices()
             .fold(String::with_capacity(self.len()), |mut acc, x| {
                 if x.0 != 0 {
diff --git a/src/truncate/truncate.rs b/src/truncate/truncate.rs
index ef1168daf..6386ca79e 100644
--- a/src/truncate/truncate.rs
+++ b/src/truncate/truncate.rs
@@ -14,8 +14,6 @@ extern crate getopts;
 #[macro_use]
 extern crate uucore;
 
-#[allow(unused_imports)]
-use std::ascii::AsciiExt;
 use std::fs::{metadata, File, OpenOptions};
 use std::io::Result;
 use std::path::Path;
diff --git a/src/wc/wc.rs b/src/wc/wc.rs
index c7a3857f5..970016689 100644
--- a/src/wc/wc.rs
+++ b/src/wc/wc.rs
@@ -16,8 +16,6 @@ extern crate uucore;
 
 use getopts::{Matches, Options};
 
-#[allow(unused_imports)]
-use std::ascii::AsciiExt;
 use std::fs::File;
 use std::io::{stdin, BufRead, BufReader, Read};
 use std::path::Path;