diff --git a/stdlib/2and3/optparse.pyi b/stdlib/2and3/optparse.pyi
index 76f7be471..8fb468844 100644
--- a/stdlib/2and3/optparse.pyi
+++ b/stdlib/2and3/optparse.pyi
@@ -60,7 +60,7 @@ class HelpFormatter:
     def format_epilog(self, epilog: _Text) -> _Text: ...
     def format_heading(self, heading: Any) -> _Text: ...
     def format_option(self, option: OptionParser) -> _Text: ...
-    def format_option_strings(self, option: OptionParser) -> Any: ...
+    def format_option_strings(self, option: OptionParser) -> _Text: ...
     def format_usage(self, usage: Any) -> _Text: ...
     def indent(self) -> None: ...
     def set_long_opt_delimiter(self, delim: _Text) -> None: ...