diff --git a/reactos/include/ddk/iodef.h b/reactos/include/ddk/iodef.h
index 71fb9d4bb6b..85eabc1ffa2 100644
--- a/reactos/include/ddk/iodef.h
+++ b/reactos/include/ddk/iodef.h
@@ -448,6 +448,7 @@ enum
 /*
  * special ByteOffset values
  */
+#define FILE_WRITE_TO_END_OF_FILE               0xffffffff
 #define FILE_USE_FILE_POINTER_POSITION          0xfffffffe
 
 typedef ULONG FS_INFORMATION_CLASS, *PFS_INFORMATION_CLASS;