diff --git a/tests/ansible/tests/connection_test.py b/tests/ansible/tests/connection_test.py
index 0ade6994..649f8b65 100644
--- a/tests/ansible/tests/connection_test.py
+++ b/tests/ansible/tests/connection_test.py
@@ -2,7 +2,11 @@ from __future__ import absolute_import
 import os
 import tempfile
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
+
 import ansible.errors
 import ansible.playbook.play_context
 
diff --git a/tests/ansible/tests/target_test.py b/tests/ansible/tests/target_test.py
index 0e588baa..806175ed 100644
--- a/tests/ansible/tests/target_test.py
+++ b/tests/ansible/tests/target_test.py
@@ -4,7 +4,10 @@ import subprocess
 import tempfile
 import unittest
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import ansible_mitogen.target
 import testlib
diff --git a/tests/broker_test.py b/tests/broker_test.py
index d58d9480..41b95387 100644
--- a/tests/broker_test.py
+++ b/tests/broker_test.py
@@ -1,4 +1,7 @@
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import testlib
 
diff --git a/tests/importer_test.py b/tests/importer_test.py
index e86af8af..33aafe93 100644
--- a/tests/importer_test.py
+++ b/tests/importer_test.py
@@ -4,7 +4,10 @@ import types
 import zlib
 import unittest
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import mitogen.core
 import mitogen.utils
diff --git a/tests/io_op_test.py b/tests/io_op_test.py
index 55adfa11..e0ad65f1 100644
--- a/tests/io_op_test.py
+++ b/tests/io_op_test.py
@@ -1,7 +1,10 @@
 import errno
 import select
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import testlib
 import mitogen.core
diff --git a/tests/log_handler_test.py b/tests/log_handler_test.py
index 43b986cb..da929426 100644
--- a/tests/log_handler_test.py
+++ b/tests/log_handler_test.py
@@ -1,8 +1,12 @@
 import logging
-import mock
 import sys
 import unittest
 
+try:
+    from unittest import mock
+except ImportError:
+    import mock
+
 import testlib
 import mitogen.core
 import mitogen.master
diff --git a/tests/message_test.py b/tests/message_test.py
index 2d2299d1..fc50a327 100644
--- a/tests/message_test.py
+++ b/tests/message_test.py
@@ -2,7 +2,10 @@ import sys
 import struct
 import unittest
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import mitogen.core
 import mitogen.master
diff --git a/tests/mitogen_protocol_test.py b/tests/mitogen_protocol_test.py
index d6e3cc95..46a0cd65 100644
--- a/tests/mitogen_protocol_test.py
+++ b/tests/mitogen_protocol_test.py
@@ -1,4 +1,7 @@
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import mitogen.core
 
diff --git a/tests/parent_test.py b/tests/parent_test.py
index fa7e4fb7..558a89b6 100644
--- a/tests/parent_test.py
+++ b/tests/parent_test.py
@@ -6,7 +6,10 @@ import sys
 import time
 import unittest
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 import testlib
 
 import mitogen.core
diff --git a/tests/policy_function_test.py b/tests/policy_function_test.py
index 843f8b7c..77bd17d1 100644
--- a/tests/policy_function_test.py
+++ b/tests/policy_function_test.py
@@ -1,4 +1,7 @@
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import mitogen.core
 import mitogen.parent
diff --git a/tests/reaper_test.py b/tests/reaper_test.py
index b60b13a4..8588a1bc 100644
--- a/tests/reaper_test.py
+++ b/tests/reaper_test.py
@@ -1,7 +1,10 @@
 import signal
 
 import testlib
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import mitogen.parent
 
diff --git a/tests/responder_test.py b/tests/responder_test.py
index 1131b421..d1e65816 100644
--- a/tests/responder_test.py
+++ b/tests/responder_test.py
@@ -1,9 +1,13 @@
-import mock
 import textwrap
 import subprocess
 import sys
 import unittest
 
+try:
+    from unittest import mock
+except ImportError:
+    import mock
+
 import mitogen.master
 import testlib
 
diff --git a/tests/timer_test.py b/tests/timer_test.py
index dac4d7df..f8f203a9 100644
--- a/tests/timer_test.py
+++ b/tests/timer_test.py
@@ -1,4 +1,7 @@
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 import mitogen.core
 import mitogen.parent