diff --git a/tests/test_registry.py b/tests/test_registry.py
index 538658a..6dfcf0c 100644
--- a/tests/test_registry.py
+++ b/tests/test_registry.py
@@ -142,7 +142,7 @@ def test_fresh_time_basic(self):
     def test_fresh_time_advanced(self):
         p = uberjob.Plan()
         r = uberjob.Registry()
-        t0 = dt.datetime.now()
+        t0 = dt.datetime.utcnow()
         store_a = TestStore(7, modified_time=t0)
         a = r.source(p, store_a)
         store_c = TestStore()