diff --git a/poetry/packages/locker.py b/poetry/packages/locker.py
index 84bf2ce242b..623e2d7745e 100644
--- a/poetry/packages/locker.py
+++ b/poetry/packages/locker.py
@@ -180,11 +180,7 @@ def locked_repository(
                 root_dir = self._lock.path.parent
                 if package.source_type == "directory":
                     # root dir should be the source of the package relative to the lock path
-                    root_dir = Path(
-                        os.path.relpath(
-                            Path(package.source_url), self._lock.path.parent
-                        )
-                    ).resolve()
+                    root_dir = Path(package.source_url)
 
                 if isinstance(constraint, list):
                     for c in constraint: