diff --git a/lib/std/os/windows/bits.zig b/lib/std/os/windows/bits.zig
index bf786d5c91502d04f061e8f8caf83adbff548158..f1f583b68dca88ec317336ee92799f7d76ee31ef 100644
--- a/lib/std/os/windows/bits.zig
+++ b/lib/std/os/windows/bits.zig
@@ -60,6 +60,7 @@ pub const SIZE_T = usize;
 pub const TCHAR = if (UNICODE) WCHAR else u8;
 pub const UINT = c_uint;
 pub const ULONG_PTR = usize;
+pub const LONG_PTR = isize;
 pub const DWORD_PTR = ULONG_PTR;
 pub const UNICODE = false;
 pub const WCHAR = u16;
diff --git a/lib/std/os/windows/ole32.zig b/lib/std/os/windows/ole32.zig
index f46ee330474f568f98661e1a21f261bc1efdf538..b3048873d047148d2233c69be5b9db86aa948f8d 100644
--- a/lib/std/os/windows/ole32.zig
+++ b/lib/std/os/windows/ole32.zig
@@ -8,4 +8,4 @@ usingnamespace @import("bits.zig");
 pub extern "ole32" fn CoTaskMemFree(pv: LPVOID) callconv(.Stdcall) void;
 pub extern "ole32" fn CoUninitialize() callconv(.Stdcall) void;
 pub extern "ole32" fn CoGetCurrentProcess() callconv(.Stdcall) DWORD;
-pub extern "ole32" fn CoInitializeEx(pvReserved: LPVOID, dwCoInit: DWORD) callconv(.Stdcall) HRESULT;
+pub extern "ole32" fn CoInitializeEx(pvReserved: ?LPVOID, dwCoInit: DWORD) callconv(.Stdcall) HRESULT;