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-rw-r--r--sphinx/ext/doctest.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/sphinx/ext/doctest.py b/sphinx/ext/doctest.py
index fa6cbed6d..c4898d583 100644
--- a/sphinx/ext/doctest.py
+++ b/sphinx/ext/doctest.py
@@ -318,8 +318,8 @@ class DocTestBuilder(Builder):
date = time.strftime('%Y-%m-%d %H:%M:%S')
self.outfile = None # type: IO
- self.outfile = codecs.open(path.join(self.outdir, 'output.txt'), # type: ignore
- 'w', encoding='utf-8')
+ self.outfile = open(path.join(self.outdir, 'output.txt'), # type: ignore
+ 'w', encoding='utf-8')
self.outfile.write(('Results of doctest builder run on %s\n'
'==================================%s\n') %
(date, '=' * len(date)))