diff --git a/src/uu/sort/src/external_sort/mod.rs b/src/uu/sort/src/external_sort/mod.rs
index 9fcaadcc3..e2595fc78 100644
--- a/src/uu/sort/src/external_sort/mod.rs
+++ b/src/uu/sort/src/external_sort/mod.rs
@@ -1,4 +1,4 @@
-use std::{clone::Clone};
+use std::clone::Clone;
 use std::cmp::Ordering::Less;
 use std::collections::VecDeque;
 use std::error::Error;
@@ -92,10 +92,11 @@ where
         let mut idx = 0;
         for chunk_num in 0..self.chunks as usize {
             if !self.buffers[chunk_num].is_empty() {
-                if self.buffers[idx].is_empty() || (super::compare_by)(
+                if self.buffers[idx].is_empty()
+                    || (super::compare_by)(
                         self.buffers[chunk_num].front().unwrap(),
                         self.buffers[idx].front().unwrap(),
-                        &self.settings
+                        &self.settings,
                     ) == Less
                 {
                     idx = chunk_num;
@@ -106,7 +107,7 @@ where
         // unwrap due to checks above
         let r = self.buffers[idx].pop_front().unwrap();
         Some(Ok(r))
-     }
+    }
 }
 
 /// Perform an external sort on an unsorted stream of incoming data
@@ -126,7 +127,11 @@ where
 {
     /// Create a new `ExternalSorter` with a specified memory buffer and
     /// temporary directory
-    pub fn new(buffer_bytes: u64, tmp_dir: Option<PathBuf>, settings: GlobalSettings) -> ExternalSorter<Line> {
+    pub fn new(
+        buffer_bytes: u64,
+        tmp_dir: Option<PathBuf>,
+        settings: GlobalSettings,
+    ) -> ExternalSorter<Line> {
         ExternalSorter {
             buffer_bytes,
             tmp_dir,
@@ -142,7 +147,11 @@ where
     ///
     /// This method can fail due to issues writing intermediate sorted chunks
     /// to disk, or due to serde serialization issues
-    pub fn sort_by<I>(&self, unsorted: I, settings: GlobalSettings) -> Result<ExtSortedIterator<Line>, Box<dyn Error>>
+    pub fn sort_by<I>(
+        &self,
+        unsorted: I,
+        settings: GlobalSettings,
+    ) -> Result<ExtSortedIterator<Line>, Box<dyn Error>>
     where
         I: Iterator<Item = Line>,
     {
@@ -193,7 +202,10 @@ where
             }
 
             // initialize buffers for each chunk
-            iter.max_per_chunk = self.buffer_bytes.checked_div(iter.chunks).unwrap_or(self.buffer_bytes);
+            iter.max_per_chunk = self
+                .buffer_bytes
+                .checked_div(iter.chunks)
+                .unwrap_or(self.buffer_bytes);
             iter.buffers = vec![VecDeque::new(); iter.chunks as usize];
             iter.chunk_offsets = vec![0 as u64; iter.chunks as usize];
             for chunk_num in 0..iter.chunks {
@@ -221,7 +233,11 @@ where
     }
 }
 
-fn fill_buff<Line>(vec: &mut VecDeque<Line>, file: File, max_bytes: u64) -> Result<u64, Box<dyn Error>>
+fn fill_buff<Line>(
+    vec: &mut VecDeque<Line>,
+    file: File,
+    max_bytes: u64,
+) -> Result<u64, Box<dyn Error>>
 where
     Line: ExternallySortable,
 {
diff --git a/src/uu/sort/src/sort.rs b/src/uu/sort/src/sort.rs
index 8d513b837..a519bece5 100644
--- a/src/uu/sort/src/sort.rs
+++ b/src/uu/sort/src/sort.rs
@@ -15,11 +15,11 @@
 #[macro_use]
 extern crate uucore;
 
-mod numeric_str_cmp;
 mod external_sort;
+mod numeric_str_cmp;
 
-use external_sort::{ExternalSorter, ExternallySortable};
 use clap::{App, Arg};
+use external_sort::{ExternalSorter, ExternallySortable};
 use fnv::FnvHasher;
 use itertools::Itertools;
 use numeric_str_cmp::{numeric_str_cmp, NumInfo, NumInfoParseSettings};
@@ -39,9 +39,9 @@ use std::io::{stdin, stdout, BufRead, BufReader, BufWriter, Lines, Read, Write};
 use std::mem::replace;
 use std::ops::Range;
 use std::path::Path;
+use std::path::PathBuf;
 use unicode_width::UnicodeWidthStr;
 use uucore::fs::is_stdin_interactive; // for Iterator::dedup()
-use std::path::PathBuf;
 
 static NAME: &str = "sort";
 static ABOUT: &str = "Display sorted concatenation of all FILE(s).";
@@ -136,7 +136,9 @@ impl GlobalSettings {
     fn human_numeric_convert(a: &str) -> usize {
         let num_str = &a[get_leading_gen(a)];
         let (_, suf_str) = a.split_at(num_str.len());
-        let num_usize = num_str.parse::<usize>().expect("Error parsing buffer size: ");
+        let num_usize = num_str
+            .parse::<usize>()
+            .expect("Error parsing buffer size: ");
         let suf_usize: usize = match suf_str.to_uppercase().as_str() {
             // SI Units
             "K" => 1000usize,
@@ -323,7 +325,9 @@ impl Line {
                     );
                     range.shorten(num_range);
                     NumCache::WithInfo(info)
-                } else if selector.settings.mode == SortMode::GeneralNumeric && settings.buffer_size == DEFAULT_BUF_SIZE {
+                } else if selector.settings.mode == SortMode::GeneralNumeric
+                    && settings.buffer_size == DEFAULT_BUF_SIZE
+                {
                     let str = range.get_str(&line);
                     NumCache::AsF64(general_f64_parse(&str[get_leading_gen(str)]))
                 } else {
@@ -1050,7 +1054,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 .value_of(OPT_BUF_SIZE)
                 .map(String::from)
                 .unwrap_or(format!("{}", DEFAULT_BUF_SIZE));
-        
+
             GlobalSettings::human_numeric_convert(&input)
         }
     }
@@ -1261,13 +1265,17 @@ fn exec_check_file(unwrapped_lines: &[Line], settings: &GlobalSettings) -> i32 {
 }
 
 fn ext_sort_by(unsorted: Vec<Line>, settings: GlobalSettings) -> Vec<Line> {
-    let external_sorter = ExternalSorter::new(settings.buffer_size as u64, Some(settings.tmp_dir.clone()), settings.clone());
+    let external_sorter = ExternalSorter::new(
+        settings.buffer_size as u64,
+        Some(settings.tmp_dir.clone()),
+        settings.clone(),
+    );
     let iter = external_sorter
         .sort_by(unsorted.into_iter(), settings.clone())
         .unwrap()
         .map(|x| x.unwrap())
         .collect::<Vec<Line>>();
-    iter                         
+    iter
 }
 
 fn sort_by(lines: &mut Vec<Line>, settings: &GlobalSettings) {
@@ -1291,18 +1299,19 @@ fn compare_by(a: &Line, b: &Line, global_settings: &GlobalSettings) -> Ordering
                     (b_str, b_selection.num_cache.as_num_info()),
                 ),
                 // serde JSON has issues with f64 null values, so caching them won't work for us with ext sort
-                SortMode::GeneralNumeric => 
+                SortMode::GeneralNumeric => {
                     if global_settings.buffer_size == DEFAULT_BUF_SIZE {
                         general_numeric_compare(
                             a_selection.num_cache.as_f64(),
-                        b_selection.num_cache.as_f64()
-                    )
+                            b_selection.num_cache.as_f64(),
+                        )
                     } else {
                         general_numeric_compare(
                             general_f64_parse(&a_str[get_leading_gen(a_str)]),
-                            general_f64_parse(&b_str[get_leading_gen(b_str)])
-                    )
-                    },
+                            general_f64_parse(&b_str[get_leading_gen(b_str)]),
+                        )
+                    }
+                }
                 SortMode::Month => month_compare(a_str, b_str),
                 SortMode::Version => version_compare(a_str, b_str),
                 SortMode::Default => default_compare(a_str, b_str),
diff --git a/tests/by-util/test_sort.rs b/tests/by-util/test_sort.rs
index c5b63205f..86951c1a4 100644
--- a/tests/by-util/test_sort.rs
+++ b/tests/by-util/test_sort.rs
@@ -33,7 +33,8 @@ fn test_helper(file_name: &str, args: &str) {
 fn test_larger_than_specified_segment() {
     new_ucmd!()
         .arg("-n")
-        .arg("-S 50M")
+        .arg("-S")
+        .arg("50K")
         .arg("ext_sort.txt")
         .succeeds()
         .stdout_is_fixture(format!("{}", "ext_sort.expected"));