diff --git a/stdlib/2and3/decimal.pyi b/stdlib/2and3/decimal.pyi
index 0eebc2e6f..6adff15d0 100644
--- a/stdlib/2and3/decimal.pyi
+++ b/stdlib/2and3/decimal.pyi
@@ -2,7 +2,7 @@ import numbers
 import sys
 from types import TracebackType
 from typing import (
-    Any, Container, Dict, List, NamedTuple, Optional, Sequence, Text, Tuple, Type, TypeVar, Union,
+    Any, Container, Dict, List, NamedTuple, Optional, overload, Sequence, Text, Tuple, Type, TypeVar, Union,
 )
 
 _Decimal = Union[Decimal, int]
@@ -121,7 +121,12 @@ class Decimal(object):
     def conjugate(self) -> Decimal: ...
     def __complex__(self) -> complex: ...
     if sys.version_info >= (3,):
-        def __round__(self, n: Optional[int] = ...) -> int: ...
+        @overload
+        def __round__(self) -> int: ...
+        @overload
+        def __round__(self, ndigits: None) -> int: ...
+        @overload
+        def __round__(self, ndigits: int) -> Decimal: ...
         def __floor__(self) -> int: ...
         def __ceil__(self) -> int: ...
     else: