diff --git a/beets/ui/__init__.py b/beets/ui/__init__.py
index 9afe5d6ab6..768eb76c78 100644
--- a/beets/ui/__init__.py
+++ b/beets/ui/__init__.py
@@ -329,11 +329,13 @@ def input_yn(prompt, require=False):
 
 def human_bytes(size):
     """Formats size, a number of bytes, in a human-readable way."""
-    suffices = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB', 'HB']
-    for suffix in suffices:
+    powers = ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y', 'H']
+    unit = 'B'
+    for power in powers:
         if size < 1024:
-            return "%3.1f %s" % (size, suffix)
+            return "%3.1f %s%s" % (size, power, unit)
         size /= 1024.0
+        unit = 'iB'
     return "big"
 
 
diff --git a/test/test_ui.py b/test/test_ui.py
index 0685742ec1..c1c853e035 100644
--- a/test/test_ui.py
+++ b/test/test_ui.py
@@ -1012,14 +1012,14 @@ def test_summarize_items(self):
 
         i2 = deepcopy(self.item)
         summary = commands.summarize_items([self.item, i2], False)
-        self.assertEqual(summary, "2 items, F, 4kbps, 21:48, 1.9 KB")
+        self.assertEqual(summary, "2 items, F, 4kbps, 21:48, 1.9 KiB")
 
         i2.format = "G"
         summary = commands.summarize_items([self.item, i2], False)
-        self.assertEqual(summary, "2 items, F 1, G 1, 4kbps, 21:48, 1.9 KB")
+        self.assertEqual(summary, "2 items, F 1, G 1, 4kbps, 21:48, 1.9 KiB")
 
         summary = commands.summarize_items([self.item, i2, i2], False)
-        self.assertEqual(summary, "3 items, G 2, F 1, 4kbps, 32:42, 2.9 KB")
+        self.assertEqual(summary, "3 items, G 2, F 1, 4kbps, 32:42, 2.9 KiB")
 
 
 class PathFormatTest(_common.TestCase):
diff --git a/test/test_ui_init.py b/test/test_ui_init.py
new file mode 100644
index 0000000000..f31deefe77
--- /dev/null
+++ b/test/test_ui_init.py
@@ -0,0 +1,67 @@
+# -*- coding: utf8 -*-
+# This file is part of beets.
+# Copyright 2015, Adrian Sampson.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+
+"""Test module for file ui/__init__.py
+"""
+from test import _common
+from test._common import unittest
+
+from beets import ui
+
+
+class InitTest(_common.LibTestCase):
+    def setUp(self):
+        super(InitTest, self).setUp()
+
+    def test_human_bytes(self):
+        tests = [
+            (0, '0.0 B'),
+            (30, '30.0 B'),
+            (pow(2, 10), '1.0 KiB'),
+            (pow(2, 20), '1.0 MiB'),
+            (pow(2, 30), '1.0 GiB'),
+            (pow(2, 40), '1.0 TiB'),
+            (pow(2, 50), '1.0 PiB'),
+            (pow(2, 60), '1.0 EiB'),
+            (pow(2, 70), '1.0 ZiB'),
+            (pow(2, 80), '1.0 YiB'),
+            (pow(2, 90), '1.0 HiB'),
+            (pow(2, 100), 'big'),
+        ]
+        for i, h in tests:
+            self.assertEqual(h, ui.human_bytes(i))
+
+    def test_human_seconds(self):
+        tests = [
+            (0, '0.0 seconds'),
+            (30, '30.0 seconds'),
+            (60, '1.0 minutes'),
+            (90, '1.5 minutes'),
+            (125, '2.1 minutes'),
+            (3600, '1.0 hours'),
+            (86400, '1.0 days'),
+            (604800, '1.0 weeks'),
+            (31449600, '1.0 years'),
+            (314496000, '1.0 decades'),
+        ]
+        for i, h in tests:
+            self.assertEqual(h, ui.human_seconds(i))
+
+
+def suite():
+    return unittest.TestLoader().loadTestsFromName(__name__)
+
+if __name__ == b'__main__':
+    unittest.main(defaultTest='suite')