diff --git a/before_after/__init__.py b/before_after/__init__.py
index 1081684..e713a61 100644
--- a/before_after/__init__.py
+++ b/before_after/__init__.py
@@ -50,7 +50,10 @@ def inner(*a, **k):
             return ret
         return inner
 
-    from mock import patch
+    if sys.version_info >= (3, 3):
+        from unittest.mock import patch
+    else:
+        from mock import patch
 
     patcher = patch(target, **kwargs)
     original, _ = patcher.get_original()
diff --git a/setup.py b/setup.py
index 572470c..b1167df 100644
--- a/setup.py
+++ b/setup.py
@@ -31,8 +31,9 @@
         'Natural Language :: English',
         'Operating System :: OS Independent',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
     ],
     keywords=['testing', 'race conditions'],
 
-    install_requires=['mock>=1.0.1'],
+    install_requires=['mock>=1.0.1; python_version < "3.3"'],
 )