diff --git a/stix2/sources/memory.py b/stix2/sources/memory.py
index f094f90..0c208a8 100644
--- a/stix2/sources/memory.py
+++ b/stix2/sources/memory.py
@@ -297,7 +297,6 @@ class MemorySource(DataSource):
 
         if stix_data["type"] == "bundle":
             for stix_obj in stix_data["objects"]:
-                print(stix_obj)
                 _add(self, stix_data=parse(stix_obj, allow_custom=self.allow_custom, version=stix_data["spec_version"]))
         else:
             _add(self, stix_data=parse(stix_obj, allow_custom=self.allow_custom, version=version))
diff --git a/stix2/test/test_versioning.py b/stix2/test/test_versioning.py
index 233587e..dcbd3d3 100644
--- a/stix2/test/test_versioning.py
+++ b/stix2/test/test_versioning.py
@@ -223,8 +223,8 @@ def test_remove_custom_stix_property():
     mal_nc = stix2.utils.remove_custom_stix(mal)
 
     assert "x_custom" not in mal_nc
-    assert stix2.utils.parse_into_datetime(mal["modified"], precision="millisecond") < stix2.utils.parse_into_datetime(mal_nc["modified"],
-                                                                                                                       precision="millisecond")
+    assert stix2.utils.parse_into_datetime(mal["modified"], precision="microsecond") < stix2.utils.parse_into_datetime(mal_nc["modified"],
+                                                                                                                       precision="microsecond")
 
 
 def test_remove_custom_stix_object():
diff --git a/stix2/utils.py b/stix2/utils.py
index 10de8b0..3129a5c 100644
--- a/stix2/utils.py
+++ b/stix2/utils.py
@@ -1,5 +1,4 @@
 """Utility functions and classes for the stix2 library."""
-# HACK
 from collections import Mapping
 import copy
 import datetime as dt