diff --git a/test/timecop_with_active_support_test.rb b/test/timecop_with_active_support_test.rb
index 9b672f97..dc82afb8 100644
--- a/test/timecop_with_active_support_test.rb
+++ b/test/timecop_with_active_support_test.rb
@@ -13,6 +13,6 @@ def test_travel_does_not_reduce_precision_of_time
     Timecop.travel(1)
     long_ago = Time.now
     sleep(0.000001)
-    assert_not_equal long_ago.to_f, Time.now.to_f
+    assert_not_equal long_ago.nsec, Time.now.nsec
   end
 end