diff --git a/src/pdm/backend/config.py b/src/pdm/backend/config.py
index 8c6119f..09cbe65 100644
--- a/src/pdm/backend/config.py
+++ b/src/pdm/backend/config.py
@@ -52,6 +52,8 @@ def __init__(self, root: Path, data: dict[str, Any]) -> None:
     def to_coremetadata(self) -> str:
         """Return the metadata as a Core Metadata string."""
         metadata = StandardMetadata.from_pyproject(self.data, project_dir=self.root)
+        # Fix the name field to unnormalized form.
+        metadata.name = self.metadata["name"]
         return str(metadata.as_rfc822())
 
     @classmethod