diff --git a/stdlib/2/__builtin__.pyi b/stdlib/2/__builtin__.pyi
index 30c5b124d..7a8425879 100644
--- a/stdlib/2/__builtin__.pyi
+++ b/stdlib/2/__builtin__.pyi
@@ -1012,8 +1012,22 @@ class SystemError(StandardError): ...
 class TypeError(StandardError): ...
 class UnboundLocalError(NameError): ...
 class UnicodeError(ValueError): ...
-class UnicodeDecodeError(UnicodeError): ...
-class UnicodeEncodeError(UnicodeError): ...
+class UnicodeDecodeError(UnicodeError):
+    encoding: bytes
+    object: bytes
+    start: int
+    end: int
+    reason: bytes
+    def __init__(self, __encoding: bytes, __object: bytes, __start: int, __end: int,
+                 __reason: bytes) -> None: ...
+class UnicodeEncodeError(UnicodeError):
+    encoding: bytes
+    object: unicode
+    start: int
+    end: int
+    reason: bytes
+    def __init__(self, __encoding: bytes, __object: unicode, __start: int, __end: int,
+                 __reason: bytes) -> None: ...
 class UnicodeTranslateError(UnicodeError): ...
 class ZeroDivisionError(ArithmeticError): ...