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-rw-r--r--sphinx/builders/gettext.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/builders/gettext.py b/sphinx/builders/gettext.py
index f36d0202c..aeb98aaab 100644
--- a/sphinx/builders/gettext.py
+++ b/sphinx/builders/gettext.py
@@ -110,7 +110,7 @@ class I18nBuilder(Builder):
for node, entries in traverse_translatable_index(doctree):
for typ, msg, tid, main in entries:
for m in split_index_msg(typ, msg):
- if typ == 'pair' and m in pairindextypes.values():
+ if typ == 'pair' and m in list(pairindextypes.values()):
# avoid built-in translated message was incorporated
# in 'sphinx.util.nodes.process_index_entry'
continue