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-rw-r--r--sphinx/builders/xml.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/builders/xml.py b/sphinx/builders/xml.py
index 88dfe83a9..865820c36 100644
--- a/sphinx/builders/xml.py
+++ b/sphinx/builders/xml.py
@@ -37,7 +37,7 @@ class XMLBuilder(Builder):
out_suffix = '.xml'
allow_parallel = True
- _writer_class = XMLWriter # type: Union[Type[XMLWriter], Type[PseudoXMLWriter]]
+ _writer_class: Union[Type[XMLWriter], Type[PseudoXMLWriter]] = XMLWriter
default_translator_class = XMLTranslator
def init(self) -> None: