diff --git a/stdlib/3/fileinput.pyi b/stdlib/3/fileinput.pyi
index 2d2cdd569..7b2c21b1b 100644
--- a/stdlib/3/fileinput.pyi
+++ b/stdlib/3/fileinput.pyi
@@ -1,8 +1,8 @@
-from typing import Iterable, BinaryIO
+from typing import Iterable, BinaryIO, List
 
 
 def input(
-    files=None,
+    files=List[str],
     inplace: bool=...,
     backup: str=...,
     bufsize: int=...,