diff --git a/stdlib/2/__builtin__.pyi b/stdlib/2/__builtin__.pyi
index e538d7f22..2d8da1561 100644
--- a/stdlib/2/__builtin__.pyi
+++ b/stdlib/2/__builtin__.pyi
@@ -463,11 +463,14 @@ class bytearray(MutableSequence[int]):
 class bool(int, SupportsInt, SupportsFloat):
     def __init__(self, o: object = ...) -> None: ...
 
-class slice:
-    start = 0
-    step = 0
-    stop = 0
-    def __init__(self, start: int, stop: int = 0, step: int = 0) -> None: ...
+class slice(object):
+    start = ...  # type: Optional[int]
+    step = ...  # type: Optional[int]
+    stop = ...  # type: Optional[int]
+    @overload
+    def __init__(self, stop: int = None) -> None: ...
+    @overload
+    def __init__(self, start: int = None, stop: int = None, step: int = None) -> None: ...
 
 class tuple(Sequence[_T_co], Generic[_T_co]):
     def __init__(self, iterable: Iterable[_T_co] = ...) -> None: ...
diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 7ccb5959a..2c1200dfa 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -481,10 +481,13 @@ class bool(int, SupportsInt, SupportsFloat):
     def __init__(self, o: object = ...) -> None: ...
 
 class slice:
-    start = 0
-    step = 0
-    stop = 0
-    def __init__(self, start: Optional[int], stop: Optional[int] = 0, step: Optional[int] = 0) -> None: ...
+    start = ...  # type: Optional[int]
+    step = ...  # type: Optional[int]
+    stop = ...  # type: Optional[int]
+    @overload
+    def __init__(self, stop: int = None) -> None: ...
+    @overload
+    def __init__(self, start: int = None, stop: int = None, step: int = None) -> None: ...
 
 class tuple(Sequence[_T_co], Generic[_T_co]):
     def __init__(self, iterable: Iterable[_T_co] = ...) -> None: ...