diff --git a/stdlib/pathlib.pyi b/stdlib/pathlib.pyi
index 7aec66b584e3..e390e71785b1 100644
--- a/stdlib/pathlib.pyi
+++ b/stdlib/pathlib.pyi
@@ -159,6 +159,10 @@ class Path(PurePath):
         # so it's safer to pretend they don't exist
         def owner(self) -> str: ...
         def group(self) -> str: ...
+
+    # This method does "exist" on Windows on <3.12, but always raises NotImplementedError
+    # On py312+, it works properly on Windows, as with all other platforms
+    if sys.platform != "win32" or sys.version_info >= (3, 12):
         def is_mount(self) -> bool: ...
 
     if sys.version_info >= (3, 9):
diff --git a/tests/stubtest_allowlists/win32-py310.txt b/tests/stubtest_allowlists/win32-py310.txt
index 9999729feae6..e62c9f69670a 100644
--- a/tests/stubtest_allowlists/win32-py310.txt
+++ b/tests/stubtest_allowlists/win32-py310.txt
@@ -12,4 +12,5 @@ subprocess.STARTUPINFO.copy
 
 # pathlib methods that exist on Windows, but always raise NotImplementedError,
 # so are omitted from the stub
+pathlib.Path.is_mount
 pathlib.WindowsPath.is_mount
diff --git a/tests/stubtest_allowlists/win32-py311.txt b/tests/stubtest_allowlists/win32-py311.txt
index 6a4bb0a3a451..f3eb72c32e2a 100644
--- a/tests/stubtest_allowlists/win32-py311.txt
+++ b/tests/stubtest_allowlists/win32-py311.txt
@@ -15,4 +15,5 @@ subprocess.STARTUPINFO.copy
 
 # pathlib methods that exist on Windows, but always raise NotImplementedError,
 # so are omitted from the stub
+pathlib.Path.is_mount
 pathlib.WindowsPath.is_mount
diff --git a/tests/stubtest_allowlists/win32-py37.txt b/tests/stubtest_allowlists/win32-py37.txt
index e806f8fa45a3..05db77c1edb9 100644
--- a/tests/stubtest_allowlists/win32-py37.txt
+++ b/tests/stubtest_allowlists/win32-py37.txt
@@ -14,6 +14,7 @@ urllib.parse.parse_qsl
 
 # pathlib methods that exist on Windows, but always raise NotImplementedError,
 # so are omitted from the stub
+pathlib.Path.is_mount
 pathlib.WindowsPath.group
 pathlib.WindowsPath.owner
 pathlib.WindowsPath.is_mount
diff --git a/tests/stubtest_allowlists/win32-py38.txt b/tests/stubtest_allowlists/win32-py38.txt
index 44d8c508eb3d..49369652991b 100644
--- a/tests/stubtest_allowlists/win32-py38.txt
+++ b/tests/stubtest_allowlists/win32-py38.txt
@@ -15,6 +15,7 @@ subprocess.STARTUPINFO.copy
 
 # pathlib methods that exist on Windows, but always raise NotImplementedError,
 # so are omitted from the stub
+pathlib.Path.is_mount
 pathlib.WindowsPath.group
 pathlib.WindowsPath.owner
 pathlib.WindowsPath.is_mount
diff --git a/tests/stubtest_allowlists/win32-py39.txt b/tests/stubtest_allowlists/win32-py39.txt
index 5af02679e126..f61f8653c6ad 100644
--- a/tests/stubtest_allowlists/win32-py39.txt
+++ b/tests/stubtest_allowlists/win32-py39.txt
@@ -11,4 +11,5 @@ subprocess.STARTUPINFO.copy
 
 # pathlib methods that exist on Windows, but always raise NotImplementedError,
 # so are omitted from the stub
+pathlib.Path.is_mount
 pathlib.WindowsPath.is_mount
diff --git a/tests/stubtest_allowlists/win32.txt b/tests/stubtest_allowlists/win32.txt
index 7e68abf51531..cc851bf28ba7 100644
--- a/tests/stubtest_allowlists/win32.txt
+++ b/tests/stubtest_allowlists/win32.txt
@@ -66,6 +66,3 @@ tty
 # pathlib functions that rely on modules that don't exist on Windows
 pathlib.Path.owner
 pathlib.Path.group
-# pathlib methods that exist on Windows, but always raise NotImplementedError,
-# so are omitted from the stub
-pathlib.Path.is_mount