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-rw-r--r--sphinx/util/jsonimpl.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/util/jsonimpl.py b/sphinx/util/jsonimpl.py
index e5f6a0e72..08df7f570 100644
--- a/sphinx/util/jsonimpl.py
+++ b/sphinx/util/jsonimpl.py
@@ -29,7 +29,7 @@ class SphinxJSONEncoder(json.JSONEncoder):
def dump(obj, fp, *args, **kwds):
- # type: (Any, IO, Any, Any) -> unicode
+ # type: (Any, IO, Any, Any) -> None
kwds['cls'] = SphinxJSONEncoder
json.dump(obj, fp, *args, **kwds)