diff --git a/Cargo.lock b/Cargo.lock
index 6ac2fcaea..66aa8887f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -603,7 +603,7 @@ dependencies = [
 
 [[package]]
 name = "half"
-version = "1.1.1"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -784,7 +784,7 @@ version = "0.0.1"
 dependencies = [
  "getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "pretty-bytes 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "term_grid 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "termsize 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -963,6 +963,14 @@ dependencies = [
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "number_prefix"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "numfmt"
 version = "0.0.1"
@@ -977,7 +985,7 @@ version = "0.0.1"
 dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "half 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "half 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1",
 ]
@@ -1057,15 +1065,6 @@ dependencies = [
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "pretty-bytes"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "atty 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "printenv"
 version = "0.0.1"
@@ -2076,7 +2075,7 @@ dependencies = [
 "checksum generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2"
 "checksum getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "0a7292d30132fb5424b354f5dc02512a86e4c516fe544bb7a25e7f266951b797"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
-"checksum half 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9e66d1b6cf4ea677bbae5f3d086ac8a9f70b1ff0c1b0d920b1610965375c33e0"
+"checksum half 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee6c0438de3ca4d8cac2eec62b228e2f8865cfe9ebefea720406774223fa2d2e"
 "checksum hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d6a22814455d41612f41161581c2883c0c6a1c41852729b17d5ed88f01e153aa"
 "checksum idna 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "014b298351066f1512874135335d62a789ffe78a9974f94b43ed5621951eaf7d"
 "checksum if_chain 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "61bb90bdd39e3af69b0172dfc6130f6cd6332bf040fbb9bdd4401d37adbd48b8"
@@ -2097,13 +2096,13 @@ dependencies = [
 "checksum num-integer 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f8d26da319fb45674985c78f1d1caf99aa4941f785d384a2ae36d0740bc3e2fe"
 "checksum num-traits 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b3c2bd9b9d21e48e956b763c9f37134dc62d9e95da6edb3f672cacb6caf3cd3"
 "checksum num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
+"checksum number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "dbf9993e59c894e3c08aa1c2712914e9e6bf1fcbfc6bef283e2183df345a4fee"
 "checksum onig 3.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bf9c54a94ac4d9f3eec22b189b8a727e2ded82aee21e8ae7ffbba2468739161b"
 "checksum onig_sys 67.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34d894e8da3390097d99eb197eac2ec443277551388eff0f97c5f789933350ee"
 "checksum os_pipe 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7f547689aea1f11fac90333d573854a8e3e52a9160df1c42aefa8cd16734a3c0"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
 "checksum pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "3a8b4c6b8165cd1a1cd4b9b120978131389f64bdaf456435caa41e630edba903"
 "checksum platform-info 0.1.0 (git+https://github.com/uutils/platform-info)" = "<none>"
-"checksum pretty-bytes 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "009d6edd2c1dbf2e1c0cd48a2f7766e03498d49ada7109a01c6911815c685316"
 "checksum proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "cd07deb3c6d1d9ff827999c7f9b04cdfd66b1b17ae508e14fe47b620f2282ae0"
 "checksum pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d6fdf85cda6cadfae5428a54661d431330b312bc767ddbc57adbedc24da66e32"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
diff --git a/src/ls/Cargo.toml b/src/ls/Cargo.toml
index d861b7b7d..b0304b5ca 100644
--- a/src/ls/Cargo.toml
+++ b/src/ls/Cargo.toml
@@ -10,7 +10,7 @@ path = "ls.rs"
 
 [dependencies]
 getopts = "0.2.18"
-pretty-bytes = "0.2.1"
+number_prefix = "0.2.8"
 term_grid = "0.1.5"
 termsize = "0.1.4"
 time = "0.1.40"
diff --git a/src/ls/ls.rs b/src/ls/ls.rs
index 3c7a6d1ca..eebc2b607 100644
--- a/src/ls/ls.rs
+++ b/src/ls/ls.rs
@@ -9,12 +9,12 @@
 //
 
 extern crate getopts;
-extern crate pretty_bytes;
 extern crate term_grid;
 extern crate termsize;
 extern crate time;
 extern crate unicode_width;
-use pretty_bytes::converter::convert;
+extern crate number_prefix;
+use number_prefix::{Standalone, Prefixed, decimal_prefix};
 use term_grid::{Cell, Direction, Filling, Grid, GridOptions};
 use time::{strftime, Timespec};
 
@@ -506,10 +506,10 @@ fn display_date(metadata: &Metadata, options: &getopts::Matches) -> String {
 
 fn display_file_size(metadata: &Metadata, options: &getopts::Matches) -> String {
     if options.opt_present("human-readable") {
-        convert(metadata.len() as f64)
-            .replace(" ", "")
-            .trim_right_matches("B")
-            .to_uppercase()
+        match decimal_prefix(metadata.len() as f64) {
+            Standalone(bytes) => bytes.to_string(),
+            Prefixed(prefix, bytes) => format!("{:.2}{}", bytes, prefix).to_uppercase()
+        }
     } else {
         metadata.len().to_string()
     }