diff --git a/Lib/packaging/metadata.py b/Lib/packaging/metadata.py
index 9d3f8ab..2d0ffa4 100644
--- a/Lib/packaging/metadata.py
+++ b/Lib/packaging/metadata.py
@@ -185,6 +185,7 @@
 
 _FILESAFE = re.compile('[^A-Za-z0-9.]+')
 
+
 class Metadata:
     """The metadata of a release.
 
@@ -228,10 +229,8 @@
 
     def __delitem__(self, name):
         field_name = self._convert_name(name)
-        try:
-            del self._fields[field_name]
-        except KeyError:
-            raise KeyError(name)
+        # we let a KeyError propagate
+        del self._fields[field_name]
         self._set_best_version()
 
     def __contains__(self, name):