diff --git a/stdlib/3/calendar.pyi b/stdlib/3/calendar.pyi
index 80848fd25..a9ce68684 100644
--- a/stdlib/3/calendar.pyi
+++ b/stdlib/3/calendar.pyi
@@ -1,6 +1,9 @@
-from typing import Any, Iterable, List, Optional, Tuple, Sequence
 import datetime
 
+from time import struct_time
+from typing import Any, Iterable, List, Optional, Tuple, Sequence, Union
+
+
 LocaleType = Tuple[Optional[str], Optional[str]]
 
 class IllegalMonthError(ValueError):
@@ -72,7 +75,7 @@ c = ...  # type: TextCalendar
 def setfirstweekday(firstweekday: int) -> None: ...
 def format(cols: int, colwidth: int = ..., spacing: int = ...) -> str: ...
 def formatstring(cols: int, colwidth: int = ..., spacing: int = ...) -> str: ...
-def timegm(tuple: Tuple[int, ...]) -> int: ...
+def timegm(tuple: Union[Tuple[int, ...], struct_time]) -> int: ...
 
 # Data attributes
 day_name = ...  # type: Sequence[str]