diff --git a/mitmproxy/optmanager.py b/mitmproxy/optmanager.py
index 08d155cf4..01d97af31 100644
--- a/mitmproxy/optmanager.py
+++ b/mitmproxy/optmanager.py
@@ -150,13 +150,17 @@ class OptManager:
         self.changed.connect(_call, weak=False)
 
     def __eq__(self, other):
-        return self._options == other._options
+        if isinstance(other, OptManager):
+            return self._options == other._options
+        return False
 
-    def __copy__(self):
+    def __deepcopy__(self, memodict = None):
         o = OptManager()
-        o.__dict__["_options"] = copy.deepcopy(self._options)
+        o.__dict__["_options"] = copy.deepcopy(self._options, memodict)
         return o
 
+    __copy__ = __deepcopy__
+
     def __getattr__(self, attr):
         if attr in self._options:
             return self._options[attr].current()
diff --git a/test/mitmproxy/test_optmanager.py b/test/mitmproxy/test_optmanager.py
index fe72e6bb8..d9b932277 100644
--- a/test/mitmproxy/test_optmanager.py
+++ b/test/mitmproxy/test_optmanager.py
@@ -73,6 +73,11 @@ def test_required_int():
         o.parse_setval("required_int", None)
 
 
+def test_deepcopy():
+    o = TD()
+    copy.deepcopy(o)
+
+
 def test_options():
     o = TO()
     assert o.keys() == {"bool", "one", "two", "required_int"}
@@ -244,6 +249,7 @@ def test_serialize():
     o2 = TD2()
     optmanager.load(o2, data)
     assert o2 == o
+    assert not o == 42
 
     t = """
         unknown: foo