diff --git a/stdlib/2.7/binascii.pyi b/stdlib/2.7/binascii.pyi
index 03f4d0b2c..f8b85b6da 100644
--- a/stdlib/2.7/binascii.pyi
+++ b/stdlib/2.7/binascii.pyi
@@ -1,7 +1,5 @@
 """Stubs for the binascii module."""
 
-from typing import Optional
-
 def a2b_base64(string: str) -> str: ...
 def a2b_hex(hexstr: str) -> str: ...
 def a2b_hqx(string: str) -> str: ...
@@ -12,7 +10,7 @@ def b2a_hex(data: str) -> str: ...
 def b2a_hqx(data: str) -> str: ...
 def b2a_qp(data: str, quotetabs: bool = ..., istext: bool = ..., header: bool = ...) -> str: ...
 def b2a_uu(data: str) -> str: ...
-def crc32(data: str, crc: Optional[int]) -> int: ...
+def crc32(data: str, crc: int = None) -> int: ...
 def crc_hqx(data: str, oldcrc: int) -> int: ...
 def hexlify(data: str) -> str: ...
 def rlecode_hqx(data: str) -> str: ...