diff --git a/stdlib/2.7/ConfigParser.pyi b/stdlib/2.7/ConfigParser.pyi
index 7b027ce4c..5fdf38020 100644
--- a/stdlib/2.7/ConfigParser.pyi
+++ b/stdlib/2.7/ConfigParser.pyi
@@ -1,4 +1,4 @@
-from typing import Any, Tuple
+from typing import Any, Tuple, IO
 
 __all__ = ... # type: list[str]
 DEFAULTSECT = ... # type: str
@@ -74,7 +74,7 @@ class RawConfigParser:
     def has_section(self, section: str) -> bool: ...
     def options(self, section: str) -> list[str]: ...
     def read(self, filenames: str) -> list[str]: ...
-    def readfp(self, fp: file, filename: str = ...) -> None: ...
+    def readfp(self, fp: IO[str], filename: str = ...) -> None: ...
     def get(self, section: str, option: str) -> str: ...
     def items(self, section: str) -> list[Tuple[Any,Any]]: ...
     def _get(self, section: str, conv: type, option: str) -> Any: ...