diff --git a/.travis.yml b/.travis.yml
index 1fa716b..067f536 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ env:
     - DJANGO=Django==1.6.11
 
 install:
-  - pip install flake8 coverage coveralls $DJANGO
+  - pip install flake8 coverage coveralls $DJANGO freezegun
   - pip install -e .
 
 matrix:
diff --git a/django_slowtests/testrunner.py b/django_slowtests/testrunner.py
index 23ff3e7..b7d1180 100644
--- a/django_slowtests/testrunner.py
+++ b/django_slowtests/testrunner.py
@@ -7,6 +7,16 @@
 from django.conf import settings
 
 
+try:  # pragma: no cover
+    import freezegun
+
+    def _time():
+        return freezegun.api.real_time()
+except ImportError:  # pragma: no cover
+    def _time():
+        return time.time()
+
+
 TIMINGS = {}
 NUM_SLOW_TESTS = getattr(settings, 'NUM_SLOW_TESTS', 10)
 SLOW_TEST_THRESHOLD_MS = getattr(settings, 'SLOW_TEST_THRESHOLD_MS', 0)
@@ -26,7 +36,7 @@ def run(self, result, debug=False):
             if result.shouldStop:
                 break
 
-            start_time = time.time()
+            start_time = _time()
 
             if _isnotsuite(test):
                 self._tearDownPreviousClass(test, result)
@@ -43,7 +53,7 @@ def run(self, result, debug=False):
             else:
                 test.debug()
 
-            TIMINGS[str(test)] = time.time() - start_time
+            TIMINGS[str(test)] = _time() - start_time
 
         if topLevel:
             self._tearDownPreviousClass(None, result)
diff --git a/django_slowtests/tests/fake.py b/django_slowtests/tests/fake.py
index 323c5cd..4b591e5 100644
--- a/django_slowtests/tests/fake.py
+++ b/django_slowtests/tests/fake.py
@@ -1,5 +1,6 @@
 import time
 from django.test import TestCase
+from freezegun import freeze_time
 
 
 class FakeTestCase(TestCase):
@@ -15,3 +16,17 @@ def test_slow_thing(self):
 
     def test_setup_class_was_run(self):
         self.assertTrue(self._setupClassRan)
+
+
+@freeze_time('2016-02-03 12:34:56')
+class FakeFrozenInPastTestCase(TestCase):
+
+    def test_this_should_not_have_a_negative_duration(self):
+        self.assertTrue(True)
+
+
+@freeze_time('3017-02-03 12:34:56')
+class FakeFrozenInFutureTestCase(TestCase):
+
+    def test_this_should_not_have_very_long_duration(self):
+        self.assertTrue(True)
diff --git a/django_slowtests/tests/tests.py b/django_slowtests/tests/tests.py
index c2ac14d..3aa8dae 100644
--- a/django_slowtests/tests/tests.py
+++ b/django_slowtests/tests/tests.py
@@ -1,10 +1,13 @@
 from django.test import TestCase
 from unittest import TestResult
-from ..testrunner import TimingSuite
+from ..testrunner import TimingSuite, TIMINGS
 
 
 class TimingSuiteTests(TestCase):
 
+    def setUp(self):
+        TIMINGS.clear()
+
     def test_add_a_test(self):
         from .fake import FakeTestCase
         suite = TimingSuite()
@@ -14,3 +17,23 @@ def test_add_a_test(self):
         suite.run(result)
         self.assertEquals(len(suite._tests), 2)
         self.assertEquals(len(result.errors), 0)
+
+    def test_timing_is_correct_when_freezegun_sets_time_in_past(self):
+        from .fake import FakeFrozenInPastTestCase
+        suite = TimingSuite()
+        result = TestResult()
+        suite.addTest(FakeFrozenInPastTestCase('test_this_should_not_have_a_negative_duration'))
+        suite.run(result)
+        test_name = str(suite._tests[0])
+        self.assertTrue(TIMINGS[test_name] > 0)
+        self.assertTrue(TIMINGS[test_name] < 1)
+
+    def test_timing_is_correct_when_freezegun_sets_time_in_future(self):
+        from .fake import FakeFrozenInFutureTestCase
+        suite = TimingSuite()
+        result = TestResult()
+        suite.addTest(FakeFrozenInFutureTestCase('test_this_should_not_have_very_long_duration'))
+        suite.run(result)
+        test_name = str(suite._tests[0])
+        self.assertTrue(TIMINGS[test_name] > 0)
+        self.assertTrue(TIMINGS[test_name] < 1)
diff --git a/tox.ini b/tox.ini
index 8046843..e3924f3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,4 +9,5 @@ deps =
     dj1.8: Django>=1.8,<1.9
     dj1.9: Django>=1.9,<1.10
     dj1.10: Django>=1.10,<1.11
+    freezegun>=0.1.8
 commands = coverage run setup.py test