diff --git a/antarest/study/service.py b/antarest/study/service.py
index 9b7d259e94..31bb80fa1f 100644
--- a/antarest/study/service.py
+++ b/antarest/study/service.py
@@ -993,7 +993,7 @@ def sync_studies_on_disk(
         study_paths = [study.path for study in all_studies if study.missing is None]
         missing_studies = {study.path: study for study in all_studies if study.missing is not None}
         for folder in folders:
-            study_path = str(folder.path.as_posix())
+            study_path = str(folder.path)
             if study_path not in study_paths:
                 try:
                     if study_path not in missing_studies.keys():
diff --git a/tests/storage/business/test_raw_study_service.py b/tests/storage/business/test_raw_study_service.py
index 6b14b05c77..60a6bce5f0 100644
--- a/tests/storage/business/test_raw_study_service.py
+++ b/tests/storage/business/test_raw_study_service.py
@@ -454,8 +454,7 @@ def test_copy_study(
     )
     md = study_service.copy(src_md, "dst_name", groups)
     md_id = md.id
-    tmp_path_as_posix = tmp_path.as_posix()
-    assert str(md.path) == f"{tmp_path_as_posix}{os.sep}{md_id}"
+    assert str(md.path) == f"{tmp_path}{os.sep}{md_id}"
     assert md.public_mode == PublicMode.NONE
     assert md.groups == groups
     study.get.assert_called_once_with(["study"])