diff --git a/core/sys/windows/kernel32.odin b/core/sys/windows/kernel32.odin
index 2b63595a4..97defaf23 100644
--- a/core/sys/windows/kernel32.odin
+++ b/core/sys/windows/kernel32.odin
@@ -133,6 +133,20 @@ foreign kernel32 {
 	GetExitCodeThread :: proc(thread: HANDLE, exit_code: ^DWORD) -> BOOL ---
 	TerminateThread :: proc(thread: HANDLE, exit_code: DWORD) -> BOOL ---
 
+	GetProcessAffinityMask :: proc(
+		hProcess: HANDLE,
+		lpProcessAffinityMask: PDWORD_PTR,
+		lpSystemAffinityMask: PDWORD_PTR,
+	) -> BOOL ---
+	SetProcessAffinityMask :: proc(
+		hProcess: HANDLE,
+		dwProcessAffinityMask: DWORD_PTR,
+	) -> BOOL ---
+	SetThreadAffinityMask :: proc(
+		hThread: HANDLE,
+		dwThreadAffinityMask: DWORD_PTR,
+	) -> DWORD_PTR ---
+
 	CreateSemaphoreW :: proc(attributes: LPSECURITY_ATTRIBUTES, initial_count, maximum_count: LONG, name: LPCWSTR) -> HANDLE ---
 	ReleaseSemaphore :: proc(semaphore: HANDLE, release_count: LONG, previous_count: ^LONG) -> BOOL ---