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-rw-r--r--pkg_resources/__init__.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkg_resources/__init__.py b/pkg_resources/__init__.py
index 6d0e19d6..f98516d1 100644
--- a/pkg_resources/__init__.py
+++ b/pkg_resources/__init__.py
@@ -3047,7 +3047,7 @@ class DistInfoDistribution(Distribution):
if not req.marker or req.marker.evaluate({'extra': extra}):
yield req
- common = dict.fromkeys(reqs_for_extra(None))
+ common = types.MappingProxyType(dict.fromkeys(reqs_for_extra(None)))
dm[None].extend(common)
for extra in self._parsed_pkg_info.get_all('Provides-Extra') or []: