diff --git a/stdlib/3.6/secrets.pyi b/stdlib/3.6/secrets.pyi
index bff4716c3..5069dba25 100644
--- a/stdlib/3.6/secrets.pyi
+++ b/stdlib/3.6/secrets.pyi
@@ -9,6 +9,6 @@ _T = TypeVar('_T')
 def randbelow(exclusive_upper_bound: int) -> int: ...
 def randbits(k: int) -> int: ...
 def choice(seq: Sequence[_T]) -> _T: ...
-def token_bytes(nbytes: Optional[int]) -> bytes: ...
-def token_hex(nbytes: Optional[int]) -> str: ...
-def token_urlsafe(nbytes: Optional[int]) -> str: ...
+def token_bytes(nbytes: Optional[int] = ...) -> bytes: ...
+def token_hex(nbytes: Optional[int] = ...) -> str: ...
+def token_urlsafe(nbytes: Optional[int] = ...) -> str: ...