diff --git a/django/template/defaultfilters.py b/django/template/defaultfilters.py
index cd2457d..dc10ea3 100644
--- a/django/template/defaultfilters.py
+++ b/django/template/defaultfilters.py
@@ -905,15 +905,15 @@ def filesizeformat(bytes):
     if bytes < KB:
         value = ungettext("%(size)d byte", "%(size)d bytes", bytes) % {'size': bytes}
     elif bytes < MB:
-        value = ugettext("%s KB") % filesize_number_format(bytes / KB)
+        value = ugettext("%s KiB") % filesize_number_format(bytes / KB)
     elif bytes < GB:
-        value = ugettext("%s MB") % filesize_number_format(bytes / MB)
+        value = ugettext("%s MiB") % filesize_number_format(bytes / MB)
     elif bytes < TB:
-        value = ugettext("%s GB") % filesize_number_format(bytes / GB)
+        value = ugettext("%s GiB") % filesize_number_format(bytes / GB)
     elif bytes < PB:
-        value = ugettext("%s TB") % filesize_number_format(bytes / TB)
+        value = ugettext("%s TiB") % filesize_number_format(bytes / TB)
     else:
-        value = ugettext("%s PB") % filesize_number_format(bytes / PB)
+        value = ugettext("%s PiB") % filesize_number_format(bytes / PB)
 
     return avoid_wrapping(value)