diff --git a/stdlib/dbm/gnu.pyi b/stdlib/dbm/gnu.pyi
index ef4706b97..b0e657d6a 100644
--- a/stdlib/dbm/gnu.pyi
+++ b/stdlib/dbm/gnu.pyi
@@ -1,39 +1,39 @@
+import sys
 from _typeshed import Self
 from types import TracebackType
 from typing import TypeVar, Union, overload
 
-_T = TypeVar("_T")
-_KeyType = Union[str, bytes]
-_ValueType = Union[str, bytes]
+if sys.platform != "win32":
+    _T = TypeVar("_T")
+    _KeyType = Union[str, bytes]
+    _ValueType = Union[str, bytes]
 
-open_flags: str
+    open_flags: str
 
-class error(OSError): ...
-
-# Actual typename gdbm, not exposed by the implementation
-class _gdbm:
-    def firstkey(self) -> bytes | None: ...
-    def nextkey(self, key: _KeyType) -> bytes | None: ...
-    def reorganize(self) -> None: ...
-    def sync(self) -> None: ...
-    def close(self) -> None: ...
-    def __getitem__(self, item: _KeyType) -> bytes: ...
-    def __setitem__(self, key: _KeyType, value: _ValueType) -> None: ...
-    def __delitem__(self, key: _KeyType) -> None: ...
-    def __contains__(self, key: _KeyType) -> bool: ...
-    def __len__(self) -> int: ...
-    def __enter__(self: Self) -> Self: ...
-    def __exit__(
-        self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
-    ) -> None: ...
-    @overload
-    def get(self, k: _KeyType) -> bytes | None: ...
-    @overload
-    def get(self, k: _KeyType, default: bytes | _T) -> bytes | _T: ...
-    def keys(self) -> list[bytes]: ...
-    def setdefault(self, k: _KeyType, default: _ValueType = ...) -> bytes: ...
-    # Don't exist at runtime
-    __new__: None  # type: ignore[assignment]
-    __init__: None  # type: ignore[assignment]
-
-def open(__filename: str, __flags: str = ..., __mode: int = ...) -> _gdbm: ...
+    class error(OSError): ...
+    # Actual typename gdbm, not exposed by the implementation
+    class _gdbm:
+        def firstkey(self) -> bytes | None: ...
+        def nextkey(self, key: _KeyType) -> bytes | None: ...
+        def reorganize(self) -> None: ...
+        def sync(self) -> None: ...
+        def close(self) -> None: ...
+        def __getitem__(self, item: _KeyType) -> bytes: ...
+        def __setitem__(self, key: _KeyType, value: _ValueType) -> None: ...
+        def __delitem__(self, key: _KeyType) -> None: ...
+        def __contains__(self, key: _KeyType) -> bool: ...
+        def __len__(self) -> int: ...
+        def __enter__(self: Self) -> Self: ...
+        def __exit__(
+            self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+        ) -> None: ...
+        @overload
+        def get(self, k: _KeyType) -> bytes | None: ...
+        @overload
+        def get(self, k: _KeyType, default: bytes | _T) -> bytes | _T: ...
+        def keys(self) -> list[bytes]: ...
+        def setdefault(self, k: _KeyType, default: _ValueType = ...) -> bytes: ...
+        # Don't exist at runtime
+        __new__: None  # type: ignore[assignment]
+        __init__: None  # type: ignore[assignment]
+    def open(__filename: str, __flags: str = ..., __mode: int = ...) -> _gdbm: ...
diff --git a/stdlib/dbm/ndbm.pyi b/stdlib/dbm/ndbm.pyi
index c49ad82c5..336720c79 100644
--- a/stdlib/dbm/ndbm.pyi
+++ b/stdlib/dbm/ndbm.pyi
@@ -1,35 +1,35 @@
+import sys
 from _typeshed import Self
 from types import TracebackType
 from typing import TypeVar, Union, overload
 
-_T = TypeVar("_T")
-_KeyType = Union[str, bytes]
-_ValueType = Union[str, bytes]
+if sys.platform != "win32":
+    _T = TypeVar("_T")
+    _KeyType = Union[str, bytes]
+    _ValueType = Union[str, bytes]
 
-class error(OSError): ...
+    class error(OSError): ...
+    library: str
 
-library: str
-
-# Actual typename dbm, not exposed by the implementation
-class _dbm:
-    def close(self) -> None: ...
-    def __getitem__(self, item: _KeyType) -> bytes: ...
-    def __setitem__(self, key: _KeyType, value: _ValueType) -> None: ...
-    def __delitem__(self, key: _KeyType) -> None: ...
-    def __len__(self) -> int: ...
-    def __del__(self) -> None: ...
-    def __enter__(self: Self) -> Self: ...
-    def __exit__(
-        self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
-    ) -> None: ...
-    @overload
-    def get(self, k: _KeyType) -> bytes | None: ...
-    @overload
-    def get(self, k: _KeyType, default: bytes | _T) -> bytes | _T: ...
-    def keys(self) -> list[bytes]: ...
-    def setdefault(self, k: _KeyType, default: _ValueType = ...) -> bytes: ...
-    # Don't exist at runtime
-    __new__: None  # type: ignore[assignment]
-    __init__: None  # type: ignore[assignment]
-
-def open(__filename: str, __flags: str = ..., __mode: int = ...) -> _dbm: ...
+    # Actual typename dbm, not exposed by the implementation
+    class _dbm:
+        def close(self) -> None: ...
+        def __getitem__(self, item: _KeyType) -> bytes: ...
+        def __setitem__(self, key: _KeyType, value: _ValueType) -> None: ...
+        def __delitem__(self, key: _KeyType) -> None: ...
+        def __len__(self) -> int: ...
+        def __del__(self) -> None: ...
+        def __enter__(self: Self) -> Self: ...
+        def __exit__(
+            self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+        ) -> None: ...
+        @overload
+        def get(self, k: _KeyType) -> bytes | None: ...
+        @overload
+        def get(self, k: _KeyType, default: bytes | _T) -> bytes | _T: ...
+        def keys(self) -> list[bytes]: ...
+        def setdefault(self, k: _KeyType, default: _ValueType = ...) -> bytes: ...
+        # Don't exist at runtime
+        __new__: None  # type: ignore[assignment]
+        __init__: None  # type: ignore[assignment]
+    def open(__filename: str, __flags: str = ..., __mode: int = ...) -> _dbm: ...