diff --git a/reactos/dll/win32/user32/misc/stubs.c b/reactos/dll/win32/user32/misc/stubs.c
index 3b1da347218..a7a3264aa9c 100644
--- a/reactos/dll/win32/user32/misc/stubs.c
+++ b/reactos/dll/win32/user32/misc/stubs.c
@@ -15,37 +15,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(user32);
 
-/*
- * @unimplemented
- */
-int
-WINAPI
-GetMouseMovePointsEx(
-  UINT cbSize,
-  LPMOUSEMOVEPOINT lppt,
-  LPMOUSEMOVEPOINT lpptBuf,
-  int nBufPoints,
-  DWORD resolution)
-{
-    if((cbSize != sizeof(MOUSEMOVEPOINT)) || (nBufPoints < 0) || (nBufPoints > 64))
-	{
-        SetLastError(ERROR_INVALID_PARAMETER);
-        return -1;
-    }
-
-    if(!lppt || !lpptBuf)
-	{
-        SetLastError(ERROR_NOACCESS);
-        return -1;
-    }
-
-    UNIMPLEMENTED;
-
-    SetLastError(ERROR_POINT_NOT_FOUND);
-    return -1;
-}
-
-
 /*
  * @unimplemented
  */
diff --git a/reactos/dll/win32/user32/user32.pspec b/reactos/dll/win32/user32/user32.pspec
index edfc78eaf33..109507c75e8 100644
--- a/reactos/dll/win32/user32/user32.pspec
+++ b/reactos/dll/win32/user32/user32.pspec
@@ -331,7 +331,7 @@
 @ stdcall GetMessageW(ptr long long long)
 @ stdcall GetMonitorInfoA(long ptr)
 @ stdcall GetMonitorInfoW(long ptr)
-@ stdcall GetMouseMovePointsEx(long ptr ptr long long) # Direct call NtUserGetMouseMovePointsEx
+@ stdcall GetMouseMovePointsEx(long ptr ptr long long) NtUserGetMouseMovePointsEx
 @ stdcall GetNextDlgGroupItem(long long long)
 @ stdcall GetNextDlgTabItem(long long long)
 ; @ stub GetNextQueueWindow
diff --git a/reactos/subsystems/win32/win32k/ntuser/ntstubs.c b/reactos/subsystems/win32/win32k/ntuser/ntstubs.c
index 600c2785834..077d9bd7a79 100644
--- a/reactos/subsystems/win32/win32k/ntuser/ntstubs.c
+++ b/reactos/subsystems/win32/win32k/ntuser/ntstubs.c
@@ -305,25 +305,28 @@ NtUserGetMouseMovePointsEx(
    int nBufPoints,
    DWORD resolution)
 {
+   UserEnterExclusive();
+
+   if ((cbSize != sizeof(MOUSEMOVEPOINT)) || (nBufPoints < 0) || (nBufPoints > 64))
+   {
+      SetLastWin32Error(ERROR_INVALID_PARAMETER);
+      return -1;
+   }
+
+   _SEH2_TRY
+   {
+      ProbeForRead(lppt, cbSize, 1);
+      ProbeForWrite(lpptBuf, cbSize, 1);
+   }
+   _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
+   {
+       SetLastNtError(_SEH2_GetExceptionCode());
+       SetLastWin32Error(ERROR_NOACCESS);
+   }
+   _SEH2_END;
+
 /*
-   if (cbSize != sizeof (MOUSEMOVEPOINT)
-   {
-       SetLastWin32Error(GMMP_ERR_POINT_NOT_FOUND);
-       return GMMP_ERR_POINT_NOT_FOUND;
-   }
-
-   if (!lppt)
-   {
-       SetLastWin32Error(GMMP_ERR_POINT_NOT_FOUND);
-       return GMMP_ERR_POINT_NOT_FOUND;
-   }
-
-   if (!lpptBuf)
-   {
-       SetLastWin32Error(GMMP_ERR_POINT_NOT_FOUND);
-       return GMMP_ERR_POINT_NOT_FOUND;
-   }
-
+   Call a subfunction of GetMouseMovePointsEx!
    switch(resolution)
    {
      case GMMP_USE_DISPLAY_POINTS:
@@ -335,8 +338,8 @@ NtUserGetMouseMovePointsEx(
    }
   */
    UNIMPLEMENTED
-
-   return 0;
+   UserLeave();
+   return -1;
 }