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-rw-r--r--sphinx/application.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/application.py b/sphinx/application.py
index d2fd776ff..4014a2efa 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -990,7 +990,7 @@ class Sphinx:
if isinstance(lexer, Lexer):
warnings.warn('app.add_lexer() API changed; '
'Please give lexer class instead instance',
- RemovedInSphinx40Warning)
+ RemovedInSphinx40Warning, stacklevel=2)
lexers[alias] = lexer
else:
lexer_classes[alias] = lexer