--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -614,7 +614,8 @@ class UtimeTests(unittest.TestCase):
         else:
             # bpo-30649: PPC64 Fedora 3.x buildbot requires
             # at least a delta of 14 ms
-            delta = 0.020
+            # 0.020 is still too little for out slow buildbots.
+            delta = 0.030
         st = os.stat(self.fname)
         msg = ("st_time=%r, current=%r, dt=%r"
                % (st.st_mtime, current, st.st_mtime - current))