diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 190c9974494..113b7d4d5a9 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -2072,7 +2072,7 @@ FilePrefetch(File file, pgoff_t offset, pgoff_t amount, uint32 wait_event_info)
                            file, VfdCache[file].fileName,
                            (int64) offset, (int64) amount));
  
-#if defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
+#if 0//defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
         {
                 int                     returnCode;
=====================