diff --git a/rtl/win/wininc/defines.inc b/rtl/win/wininc/defines.inc
index 7c20d0cebb..3bbf273f60 100644
--- a/rtl/win/wininc/defines.inc
+++ b/rtl/win/wininc/defines.inc
@@ -1712,6 +1712,7 @@
 
 
      INVALID_HANDLE_VALUE = HANDLE(-1);
+     INVALID_FILE_SIZE    = DWORD(-1);
 
   { GetStockObject  }