diff --git a/setup.py b/setup.py
index 02e9064e2..b4ff8ebc3 100644
--- a/setup.py
+++ b/setup.py
@@ -267,5 +267,10 @@ if sys.version_info < (3, 0):
             'bug at <https://github.com/ProgVal/Limnoria/issues> and we\'ll '
             'see together what we can do about it.',
             DeprecationWarning)
+if sys.version_info < (3, 3):
+    warnings.warn('You are installing Limnoria for Python < 3.3, which is '
+            'only partially support. Limnoria requires Python 3.4 or later '
+            'to be fully stable.',
+            DeprecationWarning)
 
 # vim:set shiftwidth=4 softtabstop=4 expandtab textwidth=79:
diff --git a/src/registry.py b/src/registry.py
index c37bf0312..1208ef2e1 100644
--- a/src/registry.py
+++ b/src/registry.py
@@ -70,6 +70,12 @@ ENCODING = 'string_escape' if minisix.PY2 else 'unicode_escape'
 decoder = codecs.getdecoder(ENCODING)
 encoder = codecs.getencoder(ENCODING)
 
+if hasattr(time, 'monotonic'):
+    monotonic_time = time.monotonic
+else:
+    # fallback for python < 3.3
+    monotonic_time = time.time
+
 _cache = utils.InsensitivePreservingDict()
 _lastModified = 0
 def open_registry(filename, clear=False):
@@ -105,7 +111,7 @@ def open_registry(filename, clear=False):
         except ValueError:
             raise InvalidRegistryFile('Error unpacking line %r' % acc)
         _cache[key] = value
-    _lastModified = time.time()
+    _lastModified = monotonic_time()
     _fd.close()
 
 CONF_FILE_HEADER = """
@@ -435,7 +441,7 @@ class Value(Group):
         if self._name == 'unset':
             self._lastModified = 0
         self.__parent.setName(*args)
-        self._lastModified = time.time()
+        self._lastModified = monotonic_time()
 
     def set(self, s):
         """Override this with a function to convert a string to whatever type
@@ -456,7 +462,7 @@ class Value(Group):
         inherited=True means the value is inherited from the parent, so if
         the parent gets a new value, this group will get the new value as
         well."""
-        self._lastModified = time.time()
+        self._lastModified = monotonic_time()
         self.value = v
         if self._supplyDefault:
             for (name, child) in list(self._children.items()):
diff --git a/src/test.py b/src/test.py
index 820ae978b..1127e71ac 100644
--- a/src/test.py
+++ b/src/test.py
@@ -87,7 +87,6 @@ def timeFastForward(extra_offset):
     mock_time_offset += extra_offset
 
 def setupMockTime():
-    mock_time_offset = 0
     time.time = mockTime
 
 def teardownMockTime():