diff --git a/stdlib/selectors.pyi b/stdlib/selectors.pyi
index 043df9253..a857d0e24 100644
--- a/stdlib/selectors.pyi
+++ b/stdlib/selectors.pyi
@@ -31,49 +31,37 @@ class BaseSelector(metaclass=ABCMeta):
     def __enter__(self) -> Self: ...
     def __exit__(self, *args: Unused) -> None: ...
 
-class SelectSelector(BaseSelector):
+class _BaseSelectorImpl(BaseSelector, metaclass=ABCMeta):
     def register(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = None) -> SelectorKey: ...
     def unregister(self, fileobj: FileDescriptorLike) -> SelectorKey: ...
-    def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
+    def modify(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = None) -> SelectorKey: ...
     def get_map(self) -> Mapping[FileDescriptorLike, SelectorKey]: ...
 
+class SelectSelector(_BaseSelectorImpl):
+    def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
+
+class _PollLikeSelector(_BaseSelectorImpl):
+    def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
+
 if sys.platform != "win32":
-    class PollSelector(BaseSelector):
-        def register(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = None) -> SelectorKey: ...
-        def unregister(self, fileobj: FileDescriptorLike) -> SelectorKey: ...
-        def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
-        def get_map(self) -> Mapping[FileDescriptorLike, SelectorKey]: ...
+    class PollSelector(_PollLikeSelector): ...
 
 if sys.platform == "linux":
-    class EpollSelector(BaseSelector):
+    class EpollSelector(_PollLikeSelector):
         def fileno(self) -> int: ...
-        def register(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = None) -> SelectorKey: ...
-        def unregister(self, fileobj: FileDescriptorLike) -> SelectorKey: ...
-        def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
-        def get_map(self) -> Mapping[FileDescriptorLike, SelectorKey]: ...
 
-class DevpollSelector(BaseSelector):
+class DevpollSelector(_PollLikeSelector):
     def fileno(self) -> int: ...
-    def register(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = ...) -> SelectorKey: ...
-    def unregister(self, fileobj: FileDescriptorLike) -> SelectorKey: ...
-    def select(self, timeout: float | None = ...) -> list[tuple[SelectorKey, _EventMask]]: ...
-    def get_map(self) -> Mapping[FileDescriptorLike, SelectorKey]: ...
 
 if sys.platform != "win32":
-    class KqueueSelector(BaseSelector):
+    class KqueueSelector(_BaseSelectorImpl):
         def fileno(self) -> int: ...
-        def register(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = None) -> SelectorKey: ...
-        def unregister(self, fileobj: FileDescriptorLike) -> SelectorKey: ...
         def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
-        def get_map(self) -> Mapping[FileDescriptorLike, SelectorKey]: ...
 
 # Not a real class at runtime, it is just a conditional alias to other real selectors.
 # The runtime logic is more fine-grained than a `sys.platform` check;
 # not really expressible in the stubs
-class DefaultSelector(BaseSelector):
-    def register(self, fileobj: FileDescriptorLike, events: _EventMask, data: Any = None) -> SelectorKey: ...
-    def unregister(self, fileobj: FileDescriptorLike) -> SelectorKey: ...
+class DefaultSelector(_BaseSelectorImpl):
     def select(self, timeout: float | None = None) -> list[tuple[SelectorKey, _EventMask]]: ...
-    def get_map(self) -> Mapping[FileDescriptorLike, SelectorKey]: ...
     if sys.platform != "win32":
         def fileno(self) -> int: ...