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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 fbaa72978..e76ba6a0f 100644
--- a/sphinx/util/jsonimpl.py
+++ b/sphinx/util/jsonimpl.py
@@ -25,7 +25,7 @@ class SphinxJSONEncoder(json.JSONEncoder):
# type: (Any) -> unicode
if isinstance(obj, UserString):
return text_type(obj)
- return json.JSONEncoder.default(self, obj)
+ return super(SphinxJSONEncoder, self).default(obj)
def dump(obj, fp, *args, **kwds):