diff --git a/panda/src/express/datagram.h b/panda/src/express/datagram.h
index 00a46ef36f..7cf50368fc 100644
--- a/panda/src/express/datagram.h
+++ b/panda/src/express/datagram.h
@@ -40,9 +40,13 @@ PUBLISHED:
   INLINE Datagram();
   INLINE Datagram(const void *data, size_t size);
   INLINE explicit Datagram(vector_uchar data);
-
+  Datagram(const Datagram &copy) = default;
+  Datagram(Datagram &&from) noexcept = default;
   virtual ~Datagram();
 
+  Datagram &operator = (const Datagram &copy) = default;
+  Datagram &operator = (Datagram &&from) noexcept = default;
+
   virtual void clear();
   void dump_hex(ostream &out, unsigned int indent=0) const;
 
diff --git a/tests/putil/test_datagram.py b/tests/putil/test_datagram.py
index 47b1432368..171363109a 100644
--- a/tests/putil/test_datagram.py
+++ b/tests/putil/test_datagram.py
@@ -96,8 +96,8 @@ def test_iterator(datagram_small):
     dgi = core.DatagramIterator(dg)
     verify(dgi)
 
+
 # This tests the copy constructor:
-@pytest.mark.xfail
 def test_copy(datagram_small):
     dg, verify = datagram_small
 
@@ -105,7 +105,7 @@ def test_copy(datagram_small):
     dgi = core.DatagramIterator(dg2)
     verify(dgi)
 
-@pytest.mark.xfail
+
 def test_assign(datagram_small):
     dg, verify = datagram_small