diff --git a/poetry/packages/locker.py b/poetry/packages/locker.py
index 2283a2373d2..0e244897c99 100644
--- a/poetry/packages/locker.py
+++ b/poetry/packages/locker.py
@@ -231,7 +231,9 @@ def __get_locked_package(
                     continue
 
                 # we make a copy to avoid any side-effects
-                requirement = deepcopy(requirement)
+                requirement = deepcopy(
+                    packages_by_name[requirement.name].to_dependency()
+                )
                 requirement._category = pkg.category
 
                 if pinned_versions: