diff --git a/netlib/odict.py b/netlib/odict.py
index 7a2f611b2..7a54f282f 100644
--- a/netlib/odict.py
+++ b/netlib/odict.py
@@ -108,6 +108,12 @@ class ODict(object):
         lst = copy.deepcopy(self.lst)
         return self.__class__(lst)
 
+    def extend(self, other):
+        """
+            Add the contents of other, preserving any duplicates.
+        """
+        self.lst.extend(other.lst)
+
     def __repr__(self):
         elements = []
         for itm in self.lst:
diff --git a/test/test_odict.py b/test/test_odict.py
index d90bc6e56..c2415b6d3 100644
--- a/test/test_odict.py
+++ b/test/test_odict.py
@@ -109,6 +109,12 @@ class TestODict:
         assert self.od.get_first("one") == "two"
         assert self.od.get_first("two") == None
 
+    def test_extend(self):
+        a = odict.ODict([["a", "b"], ["c", "d"]])
+        b = odict.ODict([["a", "b"], ["e", "f"]])
+        a.extend(b)
+        assert len(a) == 4
+        assert a["a"] == ["b", "b"]
 
 class TestODictCaseless:
     def setUp(self):
@@ -144,4 +150,3 @@ class TestODictCaseless:
         assert self.od.keys() == ["foo"]
         self.od.add("bar", 2)
         assert len(self.od.keys()) == 2
-