diff --git a/core/sys/windows/types.odin b/core/sys/windows/types.odin
index c15f18830..447bbda11 100644
--- a/core/sys/windows/types.odin
+++ b/core/sys/windows/types.odin
@@ -58,6 +58,7 @@ LPARAM :: LONG_PTR
 WPARAM :: UINT_PTR
 LRESULT :: LONG_PTR
 LPRECT :: ^RECT
+LPPOINT :: ^POINT
 
 UINT8  ::  u8
 UINT16 :: u16
diff --git a/core/sys/windows/user32.odin b/core/sys/windows/user32.odin
index 2336878ef..c9267da76 100644
--- a/core/sys/windows/user32.odin
+++ b/core/sys/windows/user32.odin
@@ -97,6 +97,7 @@ foreign user32 {
 	LoadCursorW :: proc(hInstance: HINSTANCE, lpCursorName: LPCWSTR) -> HCURSOR ---
 
 	GetClientRect :: proc(hWnd: HWND, lpRect: ^RECT) -> BOOL ---
+	ClientToScreen :: proc(hWnd: HWND, lpPoint: LPPOINT) -> BOOL ---
 	SetWindowPos :: proc(
 		hWnd: HWND,
 		hWndInsertAfter: HWND,