diff --git a/stdlib/3/traceback.pyi b/stdlib/3/traceback.pyi
index b3913b3e2..de7d74b9c 100644
--- a/stdlib/3/traceback.pyi
+++ b/stdlib/3/traceback.pyi
@@ -9,7 +9,7 @@ def format_exception_only(etype, value): ...
 def format_exception(type: type, value: List[str], tb: TracebackType, limit: int, chain: bool) -> str: ...
 def format_tb(traceback): ...
 def print_exc(limit=..., file=..., chain=...): ...
-def format_exc(limit: int, chain: bool = ...) -> str: ...
+def format_exc(limit: int = ..., chain: bool = ...) -> str: ...
 def extract_stack(f=..., limit=...): ...
 def extract_tb(traceback, limit=...): ...
 def format_list(list): ...