diff --git a/stubs/cyclone/web.pyi b/stubs/cyclone/web.pyi
--- a/stubs/cyclone/web.pyi
+++ b/stubs/cyclone/web.pyi
@@ -3,7 +3,7 @@
 # NOTE: This dynamically typed stub was automatically generated by stubgen.
 
 from twisted.internet import protocol
-from typing import Any, Optional
+from typing import Any, Optional, List
 
 class RequestHandler:
     SUPPORTED_METHODS: Any = ...
@@ -30,8 +30,8 @@ class RequestHandler:
     def set_header(self, name: Any, value: Any) -> None: ...
     def add_header(self, name: Any, value: Any) -> None: ...
     def clear_header(self, name: Any) -> None: ...
-    def get_argument(self, name: Any, default: Any = ..., strip: bool = ...): ...
-    def get_arguments(self, name: Any, strip: bool = ...): ...
+    def get_argument(self, name: Any, default: Any = ..., strip: bool = ...) -> str: ...
+    def get_arguments(self, name: Any, strip: bool = ...) -> List[str]: ...
     def decode_argument(self, value: Any, name: Optional[Any] = ...): ...
     @property
     def cookies(self): ...