diff --git a/subiquity/client/controllers/filesystem.py b/subiquity/client/controllers/filesystem.py
index fed65685..b82ecc99 100644
--- a/subiquity/client/controllers/filesystem.py
+++ b/subiquity/client/controllers/filesystem.py
@@ -253,7 +253,7 @@ class FilesystemController(SubiquityTuiController, FilesystemManipulator):
             self.app.next_screen(coro)
             return
         status = await self.app.wait_with_progress(coro)
-        self.model = FilesystemModel(status.bootloader)
+        self.model = FilesystemModel(status.bootloader, root="/")
         self.model.load_server_data(status)
         if self.model.bootloader == Bootloader.PREP:
             self.supports_resilient_boot = False
diff --git a/subiquity/models/filesystem.py b/subiquity/models/filesystem.py
index 8a6c859a..8c425ccf 100644
--- a/subiquity/models/filesystem.py
+++ b/subiquity/models/filesystem.py
@@ -1281,7 +1281,7 @@ class ActionRenderMode(enum.Enum):
     FORMAT_MOUNT = enum.auto()
 
 
-class FilesystemModel(object):
+class FilesystemModel:
     target = None
 
     _partition_alignment_data = {
@@ -1330,10 +1330,11 @@ class FilesystemModel(object):
         else:
             return Bootloader.BIOS
 
-    def __init__(self, bootloader=None):
+    def __init__(self, bootloader=None, *, root: str):
         if bootloader is None:
             bootloader = self._probe_bootloader()
         self.bootloader = bootloader
+        self.root = root
         self.storage_version = 1
         self._probe_data = None
         self.dd_target: Optional[Disk] = None
@@ -1356,7 +1357,7 @@ class FilesystemModel(object):
         # the original state.  _orig_config plays a similar role, but is
         # expressed in terms of curtin actions, which are not what we want to
         # use on the V2 storage API.
-        orig_model = FilesystemModel(self.bootloader)
+        orig_model = FilesystemModel(self.bootloader, root=self.root)
         orig_model.target = self.target
         orig_model.load_probe_data(self._probe_data)
         return orig_model
diff --git a/subiquity/models/subiquity.py b/subiquity/models/subiquity.py
index 0ff2283a..0ac822f2 100644
--- a/subiquity/models/subiquity.py
+++ b/subiquity/models/subiquity.py
@@ -180,7 +180,7 @@ class SubiquityModel:
         self.codecs = CodecsModel()
         self.debconf_selections = DebconfSelectionsModel()
         self.drivers = DriversModel()
-        self.filesystem = FilesystemModel()
+        self.filesystem = FilesystemModel(root=root)
         self.identity = IdentityModel()
         self.integrity = IntegrityModel()
         self.kernel = KernelModel()
diff --git a/subiquity/models/tests/test_filesystem.py b/subiquity/models/tests/test_filesystem.py
index b5e18c22..de1c0715 100644
--- a/subiquity/models/tests/test_filesystem.py
+++ b/subiquity/models/tests/test_filesystem.py
@@ -135,7 +135,7 @@ class FakeStorageInfo:
 
 
 def make_model(bootloader=None, storage_version=None):
-    model = FilesystemModel()
+    model = FilesystemModel(root="/tmp")
     if bootloader is not None:
         model.bootloader = bootloader
     if storage_version is not None: