diff --git a/reactos/subsystems/win32/win32k/include/window.h b/reactos/subsystems/win32/win32k/include/window.h
index b44272dd7f6..0e6b4d6ac4c 100644
--- a/reactos/subsystems/win32/win32k/include/window.h
+++ b/reactos/subsystems/win32/win32k/include/window.h
@@ -42,7 +42,6 @@ typedef struct _WINDOW_OBJECT
   /* Pointer to the owning thread's message queue. */
   PUSER_MESSAGE_QUEUE MessageQueue;
   struct _WINDOW_OBJECT* spwndChild;
-  struct _WINDOW_OBJECT* LastChild;
   struct _WINDOW_OBJECT* spwndNext;
   struct _WINDOW_OBJECT* spwndPrev;
   /* Entry in the list of thread windows. */