diff --git a/libcst/_types.py b/libcst/_types.py
index 8df90ee5..24055a5c 100644
--- a/libcst/_types.py
+++ b/libcst/_types.py
@@ -4,7 +4,8 @@
 # LICENSE file in the root directory of this source tree.
 
 
-from typing import TYPE_CHECKING, TypeVar
+from pathlib import PurePath
+from typing import TYPE_CHECKING, TypeVar, Union
 
 if TYPE_CHECKING:
     from libcst._nodes.base import CSTNode  # noqa: F401
@@ -12,3 +13,4 @@ if TYPE_CHECKING:
 
 CSTNodeT = TypeVar("CSTNodeT", bound="CSTNode")
 CSTNodeT_co = TypeVar("CSTNodeT_co", bound="CSTNode", covariant=True)
+StrPath = Union[str, PurePath]
diff --git a/libcst/helpers/module.py b/libcst/helpers/module.py
index f9961807..2ff5ef00 100644
--- a/libcst/helpers/module.py
+++ b/libcst/helpers/module.py
@@ -9,6 +9,7 @@ from pathlib import PurePath
 from typing import List, Optional
 
 from libcst import Comment, EmptyLine, ImportFrom, Module
+from libcst._types import StrPath
 from libcst.helpers.expression import get_full_name_for_node
 
 
@@ -130,7 +131,9 @@ class ModuleNameAndPackage:
     package: str
 
 
-def calculate_module_and_package(repo_root: str, filename: str) -> ModuleNameAndPackage:
+def calculate_module_and_package(
+    repo_root: StrPath, filename: StrPath
+) -> ModuleNameAndPackage:
     # Given an absolute repo_root and an absolute filename, calculate the
     # python module name for the file.
     relative_filename = PurePath(filename).relative_to(repo_root)
diff --git a/libcst/metadata/full_repo_manager.py b/libcst/metadata/full_repo_manager.py
index 6a7c1e9a..83bb6e83 100644
--- a/libcst/metadata/full_repo_manager.py
+++ b/libcst/metadata/full_repo_manager.py
@@ -8,6 +8,7 @@ from pathlib import Path
 from typing import Collection, Dict, List, Mapping, TYPE_CHECKING
 
 import libcst as cst
+from libcst._types import StrPath
 from libcst.metadata.wrapper import MetadataWrapper
 
 if TYPE_CHECKING:
@@ -17,7 +18,7 @@ if TYPE_CHECKING:
 class FullRepoManager:
     def __init__(
         self,
-        repo_root_dir: str,
+        repo_root_dir: StrPath,
         paths: Collection[str],
         providers: Collection["ProviderT"],
         timeout: int = 5,
diff --git a/libcst/metadata/name_provider.py b/libcst/metadata/name_provider.py
index 60d8763e..1868fa66 100644
--- a/libcst/metadata/name_provider.py
+++ b/libcst/metadata/name_provider.py
@@ -114,7 +114,7 @@ class FullyQualifiedNameProvider(BatchableMetadataProvider[Collection[QualifiedN
     def gen_cache(
         cls, root_path: Path, paths: List[str], timeout: Optional[int] = None
     ) -> Mapping[str, ModuleNameAndPackage]:
-        cache = {path: calculate_module_and_package(".", path) for path in paths}
+        cache = {path: calculate_module_and_package(root_path, path) for path in paths}
         return cache
 
     def __init__(self, cache: ModuleNameAndPackage) -> None:
diff --git a/libcst/metadata/tests/test_name_provider.py b/libcst/metadata/tests/test_name_provider.py
index 9f381368..c1ba59bc 100644
--- a/libcst/metadata/tests/test_name_provider.py
+++ b/libcst/metadata/tests/test_name_provider.py
@@ -560,11 +560,14 @@ class FullyQualifiedNameProviderTest(UnitTest):
 class FullyQualifiedNameIntegrationTest(UnitTest):
     def test_with_full_repo_manager(self) -> None:
         with TemporaryDirectory() as dir:
-            fname = "pkg/mod.py"
-            (Path(dir) / "pkg").mkdir()
-            (Path(dir) / fname).touch()
-            mgr = FullRepoManager(dir, [fname], [FullyQualifiedNameProvider])
-            wrapper = mgr.get_metadata_wrapper_for_path(fname)
+            root = Path(dir)
+            file_path = root / "pkg/mod.py"
+            file_path.parent.mkdir()
+            file_path.touch()
+
+            file_path_str = file_path.as_posix()
+            mgr = FullRepoManager(root, [file_path_str], [FullyQualifiedNameProvider])
+            wrapper = mgr.get_metadata_wrapper_for_path(file_path_str)
             fqnames = wrapper.resolve(FullyQualifiedNameProvider)
             (mod, names) = next(iter(fqnames.items()))
             self.assertIsInstance(mod, cst.Module)