diff --git a/base/univention-quota/umc/python/quota/df.py b/base/univention-quota/umc/python/quota/df.py
index 1684299..350cca3 100644
--- a/base/univention-quota/umc/python/quota/df.py
+++ b/base/univention-quota/umc/python/quota/df.py
@@ -35,19 +35,20 @@
 
 import os
 
+
 class DeviceInfo:
        def __init__(self, path):
                self.path = path
                self._statvfs = os.statvfs(self.path)
 
        def free(self):
-               return (self._statvfs.f_bfree * self._statvfs.f_bsize)
+               return self._statvfs.f_bfree * self._statvfs.f_frsize
 
        def available(self):
-               return (self._statvfs.f_bavail * self._statvfs.f_bsize)
+               return self._statvfs.f_bavail * self._statvfs.f_frsize
 
        def size(self):
-               return (self._statvfs.f_blocks * self._statvfs.f_bsize)
+               return self._statvfs.f_blocks * self._statvfs.f_frsize
 
        def block_size(self):
                return self._statvfs.f_bsize