diff -ru Paste-3.0.8-orig/tests/test_fileapp.py Paste-3.0.8/tests/test_fileapp.py
--- Paste-3.0.8-orig/tests/test_fileapp.py	2019-02-28 22:09:41.000000000 +0700
+++ Paste-3.0.8/tests/test_fileapp.py	2019-03-08 17:40:52.558943604 +0700
@@ -96,7 +96,9 @@
     res = harness.get("/",status=400,
             headers={'if-modified-since':
                 'Thu, 22 Dec 3030 01:01:01 GMT'})
-    assert 400 == res.status and b"check your system clock" in res.body
+    assert 400 == res.status and (
+        b"check your system clock" in res.body or
+        b"ill-formed timestamp" in res.body)
 
 def test_file():
     tempfile = "test_fileapp.%s.txt" % (random.random())