diff --git a/src/pretty-bytes.js b/src/pretty-bytes.js
deleted file mode 100644
index b96e99ea0..000000000
--- a/src/pretty-bytes.js
+++ /dev/null
@@ -1,15 +0,0 @@
-'use strict';
-
-exports = module.exports = prettyByteSize;
-
-const assert = require('assert');
-
-// binary units (non SI) 1024 based
-function prettyByteSize(size) {
-    assert.strictEqual(typeof size, 'number');
-
-    if (!size) return 0;
-
-    const i = Math.floor(Math.log(size) / Math.log(1024));
-    return (size / Math.pow(1024, i)).toFixed(2) * 1 + ' ' + ['B', 'kB', 'MB', 'GB', 'TB'][i];
-}
diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index 9c3bc50d7..41947eaf5 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -40,7 +40,6 @@ const assert = require('assert'),
     mounts = require('../mounts.js'),
     path = require('path'),
     paths = require('../paths.js'),
-    prettyBytes = require('../pretty-bytes.js'),
     readdirp = require('readdirp'),
     safe = require('safetydance'),
     shell = require('../shell.js');
@@ -62,6 +61,16 @@ function getRootPath(apiConfig) {
     }
 }
 
+// binary units (non SI) 1024 based
+function prettyBytes(size) {
+    assert.strictEqual(typeof size, 'number');
+
+    if (!size) return 0;
+
+    const i = Math.floor(Math.log(size) / Math.log(1024));
+    return (size / Math.pow(1024, i)).toFixed(2) * 1 + ' ' + ['B', 'kB', 'MB', 'GB', 'TB'][i];
+}
+
 // the du call in the function below requires root
 async function checkPreconditions(apiConfig, dataLayout) {
     assert.strictEqual(typeof apiConfig, 'object');