diff --git a/stdlib/2and3/locale.pyi b/stdlib/2and3/locale.pyi
index bb64666bb..59ac3c452 100644
--- a/stdlib/2and3/locale.pyi
+++ b/stdlib/2and3/locale.pyi
@@ -1,5 +1,6 @@
 # Stubs for locale
 
+from decimal import Decimal
 from typing import Any, Iterable, List, Mapping, Optional, Sequence, Tuple, Union
 import sys
 
@@ -91,7 +92,7 @@ def normalize(localename: _str) -> _str: ...
 def resetlocale(category: int = ...) -> None: ...
 def strcoll(string1: _str, string2: _str) -> int: ...
 def strxfrm(string: _str) -> _str: ...
-def format(format: _str, val: int, grouping: bool = ...,
+def format(format: _str, val: Union[float, Decimal], grouping: bool = ...,
            monetary: bool = ...) -> _str: ...
 def format_string(format: _str, val: Sequence[Any],
                   grouping: bool = ...) -> _str: ...