diff --git a/stdlib/2/typing.pyi b/stdlib/2/typing.pyi
index 314743c82..e3ad6bd8c 100644
--- a/stdlib/2/typing.pyi
+++ b/stdlib/2/typing.pyi
@@ -275,7 +275,7 @@ class TextIO(IO[unicode]):
     @property
     def encoding(self) -> str: ...
     @property
-    def errors(self) -> str: ...
+    def errors(self) -> Optional[str]: ...
     @property
     def line_buffering(self) -> bool: ...
     @property
diff --git a/stdlib/3/typing.pyi b/stdlib/3/typing.pyi
index 5f232656e..4d05394f3 100644
--- a/stdlib/3/typing.pyi
+++ b/stdlib/3/typing.pyi
@@ -359,7 +359,7 @@ class TextIO(IO[str]):
     @property
     def encoding(self) -> str: ...
     @property
-    def errors(self) -> str: ...
+    def errors(self) -> Optional[str]: ...
     @property
     def line_buffering(self) -> int: ...  # int on PyPy, bool on CPython
     @property