diff --git a/core/sys/windows/user32.odin b/core/sys/windows/user32.odin
index ee536e0a8..cce9b3245 100644
--- a/core/sys/windows/user32.odin
+++ b/core/sys/windows/user32.odin
@@ -136,6 +136,7 @@ foreign user32 {
 	GetKeyboardState :: proc(lpKeyState: PBYTE) -> BOOL ---
 
 	MapVirtualKeyW :: proc(uCode: UINT, uMapType: UINT) -> UINT ---
+	ToUnicode :: proc(nVirtKey: UINT, wScanCode: UINT, lpKeyState: ^BYTE, pwszBuff: LPWSTR, cchBuff: c_int, wFlags: UINT) -> c_int ---
 
 	SetWindowsHookExW :: proc(idHook: c_int, lpfn: HOOKPROC, hmod: HINSTANCE, dwThreadId: DWORD) -> HHOOK ---
 	UnhookWindowsHookEx :: proc(hhk: HHOOK) -> BOOL ---