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-rw-r--r--setuptools/extension.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/setuptools/extension.py b/setuptools/extension.py
index eb8b836c..d7892d3d 100644
--- a/setuptools/extension.py
+++ b/setuptools/extension.py
@@ -35,7 +35,7 @@ class Extension(_Extension):
if source.endswith('.pyx'):
source = source[:-4] + '.c'
return source
- self.sources = map(pyx_to_c, self.sources)
+ self.sources = list(map(pyx_to_c, self.sources))
class Library(Extension):
"""Just like a regular Extension, but built as a library instead"""