diff --git a/stdlib/2/SocketServer.pyi b/stdlib/2/SocketServer.pyi
index 41152a2e0..3f57efbe9 100644
--- a/stdlib/2/SocketServer.pyi
+++ b/stdlib/2/SocketServer.pyi
@@ -63,23 +63,24 @@ if sys.platform != 'win32':
                      RequestHandlerClass: Callable[..., BaseRequestHandler],
                      bind_and_activate: bool = ...) -> None: ...
 
-class ForkingMixIn:
-    timeout: Optional[float]  # undocumented
-    active_children: Optional[List[int]]  # undocumented
-    max_children: int  # undocumented
-    if sys.version_info >= (3, 7):
-        block_on_close: bool
-    if sys.version_info >= (3, 6):
-        def collect_children(self, *, blocking: bool = ...) -> None: ...  # undocumented
-    else:
-        def collect_children(self) -> None: ...  # undocumented
-    def handle_timeout(self) -> None: ...  # undocumented
-    if sys.version_info >= (3, 3):
-        def service_actions(self) -> None: ...  # undocumented
-    def process_request(self, request: bytes,
-                        client_address: Tuple[str, int]) -> None: ...
-    if sys.version_info >= (3, 6):
-        def server_close(self) -> None: ...
+if sys.platform != "win32":
+    class ForkingMixIn:
+        timeout: Optional[float]  # undocumented
+        active_children: Optional[List[int]]  # undocumented
+        max_children: int  # undocumented
+        if sys.version_info >= (3, 7):
+            block_on_close: bool
+        if sys.version_info >= (3, 6):
+            def collect_children(self, *, blocking: bool = ...) -> None: ...  # undocumented
+        else:
+            def collect_children(self) -> None: ...  # undocumented
+        def handle_timeout(self) -> None: ...  # undocumented
+        if sys.version_info >= (3, 3):
+            def service_actions(self) -> None: ...  # undocumented
+        def process_request(self, request: bytes,
+                            client_address: Tuple[str, int]) -> None: ...
+        if sys.version_info >= (3, 6):
+            def server_close(self) -> None: ...
 
 class ThreadingMixIn:
     daemon_threads: bool
@@ -92,8 +93,9 @@ class ThreadingMixIn:
     if sys.version_info >= (3, 6):
         def server_close(self) -> None: ...
 
-class ForkingTCPServer(ForkingMixIn, TCPServer): ...
-class ForkingUDPServer(ForkingMixIn, UDPServer): ...
+if sys.platform != "win32":
+    class ForkingTCPServer(ForkingMixIn, TCPServer): ...
+    class ForkingUDPServer(ForkingMixIn, UDPServer): ...
 class ThreadingTCPServer(ThreadingMixIn, TCPServer): ...
 class ThreadingUDPServer(ThreadingMixIn, UDPServer): ...
 if sys.platform != 'win32':
diff --git a/stdlib/3/socketserver.pyi b/stdlib/3/socketserver.pyi
index 41152a2e0..3f57efbe9 100644
--- a/stdlib/3/socketserver.pyi
+++ b/stdlib/3/socketserver.pyi
@@ -63,23 +63,24 @@ if sys.platform != 'win32':
                      RequestHandlerClass: Callable[..., BaseRequestHandler],
                      bind_and_activate: bool = ...) -> None: ...
 
-class ForkingMixIn:
-    timeout: Optional[float]  # undocumented
-    active_children: Optional[List[int]]  # undocumented
-    max_children: int  # undocumented
-    if sys.version_info >= (3, 7):
-        block_on_close: bool
-    if sys.version_info >= (3, 6):
-        def collect_children(self, *, blocking: bool = ...) -> None: ...  # undocumented
-    else:
-        def collect_children(self) -> None: ...  # undocumented
-    def handle_timeout(self) -> None: ...  # undocumented
-    if sys.version_info >= (3, 3):
-        def service_actions(self) -> None: ...  # undocumented
-    def process_request(self, request: bytes,
-                        client_address: Tuple[str, int]) -> None: ...
-    if sys.version_info >= (3, 6):
-        def server_close(self) -> None: ...
+if sys.platform != "win32":
+    class ForkingMixIn:
+        timeout: Optional[float]  # undocumented
+        active_children: Optional[List[int]]  # undocumented
+        max_children: int  # undocumented
+        if sys.version_info >= (3, 7):
+            block_on_close: bool
+        if sys.version_info >= (3, 6):
+            def collect_children(self, *, blocking: bool = ...) -> None: ...  # undocumented
+        else:
+            def collect_children(self) -> None: ...  # undocumented
+        def handle_timeout(self) -> None: ...  # undocumented
+        if sys.version_info >= (3, 3):
+            def service_actions(self) -> None: ...  # undocumented
+        def process_request(self, request: bytes,
+                            client_address: Tuple[str, int]) -> None: ...
+        if sys.version_info >= (3, 6):
+            def server_close(self) -> None: ...
 
 class ThreadingMixIn:
     daemon_threads: bool
@@ -92,8 +93,9 @@ class ThreadingMixIn:
     if sys.version_info >= (3, 6):
         def server_close(self) -> None: ...
 
-class ForkingTCPServer(ForkingMixIn, TCPServer): ...
-class ForkingUDPServer(ForkingMixIn, UDPServer): ...
+if sys.platform != "win32":
+    class ForkingTCPServer(ForkingMixIn, TCPServer): ...
+    class ForkingUDPServer(ForkingMixIn, UDPServer): ...
 class ThreadingTCPServer(ThreadingMixIn, TCPServer): ...
 class ThreadingUDPServer(ThreadingMixIn, UDPServer): ...
 if sys.platform != 'win32':
diff --git a/third_party/2and3/werkzeug/serving.pyi b/third_party/2and3/werkzeug/serving.pyi
index 54bce9784..5b5305014 100644
--- a/third_party/2and3/werkzeug/serving.pyi
+++ b/third_party/2and3/werkzeug/serving.pyi
@@ -2,12 +2,20 @@ import sys
 from typing import Any, Optional
 
 if sys.version_info < (3,):
-    from SocketServer import ThreadingMixIn, ForkingMixIn
+    from SocketServer import ThreadingMixIn
     from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
 else:
-    from socketserver import ThreadingMixIn, ForkingMixIn
+    from socketserver import ThreadingMixIn
     from http.server import HTTPServer, BaseHTTPRequestHandler
 
+if sys.platform == "win32":
+    class ForkingMixIn(object): ...
+else:
+    if sys.version_info < (3,):
+        from SocketServer import ForkingMixIn as ForkingMixIn
+    else:
+        from socketserver import ForkingMixIn as ForkingMixIn
+
 class _SslDummy:
     def __getattr__(self, name): ...