diff --git a/reactos/lib/user32/windows/paint.c b/reactos/lib/user32/windows/paint.c
index 43a40b1f113..b32e7b5d5ec 100644
--- a/reactos/lib/user32/windows/paint.c
+++ b/reactos/lib/user32/windows/paint.c
@@ -227,7 +227,7 @@ UpdateWindow(
 
 
 /*
- * @unimplemented
+ * @implemented
  */
 BOOL
 STDCALL
@@ -235,8 +235,7 @@ ValidateRect(
   HWND hWnd,
   CONST RECT *lpRect)
 {
-  UNIMPLEMENTED;
-  return FALSE;
+  return RedrawWindow(hWnd, lpRect, 0, RDW_VALIDATE);
 }