diff --git a/scmrepo/fs.py b/scmrepo/fs.py
index cb8c5046..c01da0e4 100644
--- a/scmrepo/fs.py
+++ b/scmrepo/fs.py
@@ -1,5 +1,6 @@
 import errno
 import os
+import posixpath
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -31,7 +32,6 @@ def bytesio_len(obj: "BytesIO") -> Optional[int]:
 
 class GitFileSystem(AbstractFileSystem):
     # pylint: disable=abstract-method
-    sep = os.sep
     cachable = False
 
     def __init__(
@@ -53,21 +53,13 @@ def __init__(
             resolved = resolver(scm, rev or "HEAD")
             tree_obj = scm.pygit2.get_tree_obj(rev=resolved)
             trie = GitTrie(tree_obj, resolved)
-            path = scm.root_dir
-        else:
-            assert path
 
         self.trie = trie
-        self.root_dir = path
         self.rev = self.trie.rev
 
     def _get_key(self, path: str) -> Tuple[str, ...]:
-        from scmrepo.utils import relpath
-
-        if os.path.isabs(path):
-            path = relpath(path, self.root_dir)
-        relparts = path.split(os.sep)
-        if relparts == ["."]:
+        relparts = path.split(self.sep)
+        if relparts == [self.root_marker]:
             return ()
         return tuple(relparts)
 
@@ -101,7 +93,7 @@ def info(self, path: str, **kwargs: Any) -> Dict[str, Any]:
         try:
             return {
                 **self.trie.info(key),
-                "name": os.path.join(self.root_dir, self.sep.join(key)),
+                "name": path,
             }
         except KeyError:
             raise FileNotFoundError(
@@ -145,15 +137,13 @@ def walk(  # pylint: disable=arguments-differ
 
         key = self._get_key(top)
         for prefix, dirs, files in self.trie.walk(key, topdown=topdown):
-            root = self.root_dir
+            root = self.sep.join(prefix) if prefix else ""
 
-            if prefix:
-                root = os.path.join(root, os.sep.join(prefix))
             if detail:
                 yield (
                     root,
-                    {d: self.info(os.path.join(root, d)) for d in dirs},
-                    {f: self.info(os.path.join(root, f)) for f in files},
+                    {d: self.info(posixpath.join(root, d)) for d in dirs},
+                    {f: self.info(posixpath.join(root, f)) for f in files},
                 )
             else:
                 yield root, dirs, files
diff --git a/tests/test_fs.py b/tests/test_fs.py
index 90d3f921..c6e8113a 100644
--- a/tests/test_fs.py
+++ b/tests/test_fs.py
@@ -1,5 +1,3 @@
-import os
-
 import pytest
 from pytest_test_utils import TmpDir
 
@@ -34,7 +32,7 @@ def test_exists(tmp_dir: TmpDir, scm: Git):
     assert not fs.exists("foo")
     assert not fs.exists("тест")
     assert not fs.exists("data")
-    assert not fs.exists(os.path.join("data", "lorem"))
+    assert not fs.exists("data/lorem")
 
     scm.add_commit(files, message="add")
 
@@ -42,7 +40,7 @@ def test_exists(tmp_dir: TmpDir, scm: Git):
     assert fs.exists("foo")
     assert fs.exists("тест")
     assert fs.exists("data")
-    assert fs.exists(os.path.join("data", "lorem"))
+    assert fs.exists("data/lorem")
     assert not fs.exists("non-existing-file")
 
 
@@ -75,7 +73,7 @@ def test_walk(tmp_dir: TmpDir, scm: Git):
             "data": {"lorem": "ipsum", "subdir": {"sub": "sub"}},
         }
     )
-    scm.add_commit(os.path.join("data", "subdir"), message="add")
+    scm.add_commit("data/subdir", message="add")
     fs = scm.get_fs("master")
 
     def convert_to_sets(walk_results):
@@ -84,24 +82,22 @@ def convert_to_sets(walk_results):
             for root, dirs, nondirs in walk_results
         ]
 
-    assert convert_to_sets(fs.walk(".")) == convert_to_sets(
+    assert convert_to_sets(fs.walk("")) == convert_to_sets(
         [
-            (scm.root_dir, ["data"], []),
-            (os.path.join(scm.root_dir, "data"), ["subdir"], []),
+            ("", ["data"], []),
+            ("data", ["subdir"], []),
             (
-                os.path.join(scm.root_dir, "data", "subdir"),
+                "data/subdir",
                 [],
                 ["sub"],
             ),
         ]
     )
 
-    assert convert_to_sets(
-        fs.walk(os.path.join("data", "subdir"))
-    ) == convert_to_sets(
+    assert convert_to_sets(fs.walk("data/subdir")) == convert_to_sets(
         [
             (
-                os.path.join(scm.root_dir, "data", "subdir"),
+                "data/subdir",
                 [],
                 ["sub"],
             )
@@ -120,25 +116,25 @@ def test_ls(tmp_dir: TmpDir, scm: Git):
     scm.add_commit(files, message="add")
     fs = scm.get_fs("master")
 
-    assert fs.ls(".", detail=False) == ["foo", "тест", "data"]
-    assert fs.ls(".") == {
+    assert fs.ls("", detail=False) == ["foo", "тест", "data"]
+    assert fs.ls("") == {
         "data": {
             "mode": 16384,
-            "name": str(tmp_dir / "data"),
+            "name": "data",
             "sha": "f5d6ac1955c85410b71bb6e35e4c57c54e2ad524",
             "size": 66,
             "type": "directory",
         },
         "foo": {
             "mode": 33188,
-            "name": str(tmp_dir / "foo"),
+            "name": "foo",
             "sha": "19102815663d23f8b75a47e7a01965dcdc96468c",
             "size": 3,
             "type": "file",
         },
         "тест": {
             "mode": 33188,
-            "name": str(tmp_dir / "тест"),
+            "name": "тест",
             "sha": "eeeba1738f4c12844163b89112070c6e57eb764e",
             "size": 16,
             "type": "file",
diff --git a/tests/test_git.py b/tests/test_git.py
index bf51bb03..d0eb1919 100644
--- a/tests/test_git.py
+++ b/tests/test_git.py
@@ -126,7 +126,7 @@ def test_walk_with_submodules(
     files = []
     dirs = []
     fs = scm.get_fs("HEAD")
-    for _, dnames, fnames in fs.walk("."):
+    for _, dnames, fnames in fs.walk(""):
         dirs.extend(dnames)
         files.extend(fnames)