diff --git a/core/sys/windows/kernel32.odin b/core/sys/windows/kernel32.odin
index eba275522..16b6fa244 100644
--- a/core/sys/windows/kernel32.odin
+++ b/core/sys/windows/kernel32.odin
@@ -453,9 +453,9 @@ foreign kernel32 {
 	// [MS-Docs](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setfilecompletionnotificationmodes)
 	SetFileCompletionNotificationModes :: proc(FileHandle: HANDLE, Flags: u8) -> BOOL ---
 	// [MS-Docs](https://learn.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-createiocompletionport)
-	CreateIoCompletionPort :: proc(FileHandle: HANDLE, ExistingCompletionPort: HANDLE, CompletionKey: ^uintptr, NumberOfConcurrentThreads: DWORD) -> HANDLE ---
+	CreateIoCompletionPort :: proc(FileHandle: HANDLE, ExistingCompletionPort: HANDLE, CompletionKey: ULONG_PTR, NumberOfConcurrentThreads: DWORD) -> HANDLE ---
 	//[MS-Docs](https://learn.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-getqueuedcompletionstatus)
-	GetQueuedCompletionStatus :: proc(CompletionPort: HANDLE, lpNumberOfBytesTransferred: ^DWORD, lpCompletionKey: uintptr, lpOverlapped: ^^OVERLAPPED, dwMilliseconds: DWORD) -> BOOL ---
+	GetQueuedCompletionStatus :: proc(CompletionPort: HANDLE, lpNumberOfBytesTransferred: ^DWORD, lpCompletionKey: PULONG_PTR, lpOverlapped: ^^OVERLAPPED, dwMilliseconds: DWORD) -> BOOL ---
 	// [MS-Docs](https://learn.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-getqueuedcompletionstatusex)
 	GetQueuedCompletionStatusEx :: proc(CompletionPort: HANDLE, lpCompletionPortEntries: ^OVERLAPPED_ENTRY, ulCount: c_ulong, ulNumEntriesRemoved: ^c_ulong, dwMilliseconds: DWORD, fAlertable: BOOL) -> BOOL ---
 	// [MS-Docs](https://learn.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-postqueuedcompletionstatus)