diff --git a/pmb/helpers/other.py b/pmb/helpers/other.py
index 5dca8638..31956f6b 100644
--- a/pmb/helpers/other.py
+++ b/pmb/helpers/other.py
@@ -34,7 +34,6 @@ def folder_size(args, path):
     :returns: folder size in bytes
     """
     output = pmb.helpers.run.root(args, ["du", "--summarize",
-                                         "--apparent-size",
                                          "--block-size=1",
                                          path], output_return=True)
     ret = int(output.split("\t")[0])
diff --git a/pmb/install/format.py b/pmb/install/format.py
index 0ecd56bb..c85a2050 100644
--- a/pmb/install/format.py
+++ b/pmb/install/format.py
@@ -69,7 +69,8 @@ def format_and_mount_pm_crypt(args):
         # When changing the options of mkfs.ext4, also change them in the
         # recovery zip code (see 'grep -r mkfs\.ext4')!
         pmb.chroot.root(args, ["mkfs.ext4", "-O", "^metadata_csum", "-F",
-                               "-q", "-L", "pmOS_root", device])
+                               "-q", "-L", "pmOS_root", "-N", "100000",
+                               device])
 
     # Mount
     mountpoint = "/mnt/install"
diff --git a/test/test_folder_size.py b/test/test_folder_size.py
index c079c6c7..79b90f03 100644
--- a/test/test_folder_size.py
+++ b/test/test_folder_size.py
@@ -49,8 +49,8 @@ def test_get_folder_size(args, tmpdir):
 
     # Check if the size is correct. Unfortunately, the `du` call
     # in pmb.helpers.other.folder_size is not very accurate, so we
-    # allow 10kb of tolerance (good enough for our use case): #760
-    tolerance = 10240
+    # allow 30kb of tolerance (good enough for our use case): #760 #1717
+    tolerance = 30 * 1024
     size = 204800 * files
     result = pmb.helpers.other.folder_size(args, tmpdir)
     assert (result < size + tolerance and result > size - tolerance)