diff --git a/core/sys/windows/kernel32.odin b/core/sys/windows/kernel32.odin
index 4f7d24ce8..3eb42a3ad 100644
--- a/core/sys/windows/kernel32.odin
+++ b/core/sys/windows/kernel32.odin
@@ -120,6 +120,12 @@ foreign kernel32 {
 		bManualReset: BOOL,
 		lpTimerName: LPCWSTR,
 	) -> HANDLE ---
+	CreateWaitableTimerExW :: proc(
+		lpTimerAttributes: LPSECURITY_ATTRIBUTES,
+		lpTimerName: LPCWSTR,
+		dwFlags: DWORD,
+		dwDesiredAccess: DWORD,
+	) -> HANDLE ---
 	SetWaitableTimerEx :: proc(
 		hTimer: HANDLE,
 		lpDueTime: ^LARGE_INTEGER,
diff --git a/core/sys/windows/types.odin b/core/sys/windows/types.odin
index dadb376a6..430fbb329 100644
--- a/core/sys/windows/types.odin
+++ b/core/sys/windows/types.odin
@@ -146,6 +146,13 @@ PSRWLOCK :: ^SRWLOCK
 
 MMRESULT :: UINT
 
+CREATE_WAITABLE_TIMER_MANUAL_RESET    :: 0x00000001
+CREATE_WAITABLE_TIMER_HIGH_RESOLUTION :: 0x00000002
+
+TIMER_QUERY_STATE  :: 0x0001
+TIMER_MODIFY_STATE :: 0x0002
+TIMER_ALL_ACCESS   :: STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | TIMER_QUERY_STATE | TIMER_MODIFY_STATE
+
 SOCKET :: distinct uintptr // TODO
 socklen_t :: c_int
 ADDRESS_FAMILY :: USHORT