diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index 41947eaf5..6d50e8f6d 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -62,13 +62,13 @@ function getRootPath(apiConfig) {
 }
 
 // binary units (non SI) 1024 based
-function prettyBytes(size) {
-    assert.strictEqual(typeof size, 'number');
+function prettyBytes(bytes) {
+    assert.strictEqual(typeof bytes, 'number');
 
-    if (!size) return 0;
+    const i = Math.floor(Math.log(bytes) / Math.log(1024)),
+        sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
 
-    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];
+    return (bytes / Math.pow(1024, i)).toFixed(2) * 1 + '' + sizes[i];
 }
 
 // the du call in the function below requires root