--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -421,7 +421,7 @@ class PosixTester(unittest.TestCase):
     def test_posix_fadvise(self):
         fd = os.open(support.TESTFN, os.O_RDONLY)
         try:
-            posix.posix_fadvise(fd, 0, 0, posix.POSIX_FADV_WILLNEED)
+            posix.posix_fadvise(fd, 0, 0, posix.POSIX_FADV_RANDOM)
         finally:
             os.close(fd)