diff --git a/stdlib/2.7/__builtin__.pyi b/stdlib/2.7/__builtin__.pyi
index e110a1a35..0ce76c9ef 100644
--- a/stdlib/2.7/__builtin__.pyi
+++ b/stdlib/2.7/__builtin__.pyi
@@ -383,6 +383,7 @@ class bytearray(MutableSequence[int]):
     def expandtabs(self, tabsize: int = 8) -> bytearray: ...
     def find(self, sub: str, start: int = 0, end: int = ...) -> int: ...
     def index(self, sub: str, start: int = 0, end: int = ...) -> int: ...
+    def insert(self, index: int, object: int) -> None: ...
     def isalnum(self) -> bool: ...
     def isalpha(self) -> bool: ...
     def isdigit(self) -> bool: ...