diff --git "a/win32ss/user/ntuser/nonclient.c" "b/win32ss/user/ntuser/nonclient.c"
index 69291c50adb..bcf19e62616 100644
--- "a/win32ss/user/ntuser/nonclient.c"
+++ "b/win32ss/user/ntuser/nonclient.c"
@@ -285,6 +285,7 @@ DefWndDoSizeMove(PWND pwnd, WORD wParam)
    }
    else  /* SC_SIZE */
    {
+      RECTL_vSetEmptyRect(&pwnd->InternalPos.NormalRect);
       if (!thickframe) return;
       if (hittest && (syscommand != SC_MOUSEMENU))
       {