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-rw-r--r--sphinx/config.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/config.py b/sphinx/config.py
index f22d03be6..fdf341268 100644
--- a/sphinx/config.py
+++ b/sphinx/config.py
@@ -34,7 +34,7 @@ CONFIG_TYPE_WARNING = "The config value `{name}' has type `{current.__name__}',
"defaults to `{default.__name__}.'"
-class ENUM:
+class ENUM(object):
"""represents the config value should be a one of candidates.
Example: