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-rw-r--r--sphinx/cmd/build.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/cmd/build.py b/sphinx/cmd/build.py
index 00a06762a..ce0b14c75 100644
--- a/sphinx/cmd/build.py
+++ b/sphinx/cmd/build.py
@@ -236,7 +236,7 @@ def build_main(argv: List[str] = sys.argv[1:]) -> int:
try:
warnfile = abspath(args.warnfile)
ensuredir(path.dirname(warnfile))
- warnfp = open(args.warnfile, 'w')
+ warnfp = open(args.warnfile, 'w', encoding="utf-8")
except Exception as exc:
parser.error(__('cannot open warning file %r: %s') % (
args.warnfile, exc))