diff --git a/src/gsi/unit_tests/gsiTest.cc b/src/gsi/unit_tests/gsiTest.cc
index 9a9b1394e..dc12b26e2 100644
--- a/src/gsi/unit_tests/gsiTest.cc
+++ b/src/gsi/unit_tests/gsiTest.cc
@@ -60,10 +60,18 @@ A::A (const A &a)
   : gsi::ObjectBase (a)
 {
   ++a_count;
-  e = a.e;
-  m_d = a.m_d;
-  n = a.n;
-  f = a.f;
+  operator= (a);
+}
+
+A &A::operator= (const A &a)
+{
+  if (this != &a) {
+    e = a.e;
+    m_d = a.m_d;
+    n = a.n;
+    f = a.f;
+  }
+  return *this;
 }
 
 int A::a0 ()
diff --git a/src/gsi/unit_tests/gsiTest.h b/src/gsi/unit_tests/gsiTest.h
index e8b31e5c8..b20d7da74 100644
--- a/src/gsi/unit_tests/gsiTest.h
+++ b/src/gsi/unit_tests/gsiTest.h
@@ -81,6 +81,11 @@ struct A
    */
   ~A ();
 
+  /**
+   *  @brief Assignment
+   */
+  A &operator= (const A &a);
+
   /**
    *  @brief A static method
    */
diff --git a/src/pya/pya/pya.cc b/src/pya/pya/pya.cc
index 88cd4127d..54fa391ff 100644
--- a/src/pya/pya/pya.cc
+++ b/src/pya/pya/pya.cc
@@ -764,7 +764,7 @@ object_assign (PyObject *self, PyObject *args)
   tl_assert (cls_decl_self != 0);
 
   PyObject *src = NULL;
-  if (! PyArg_ParseTuple (args, "o", &src)) {
+  if (! PyArg_ParseTuple (args, "O", &src)) {
     return NULL;
   }
 
@@ -778,7 +778,7 @@ object_assign (PyObject *self, PyObject *args)
     throw tl::Exception (tl::to_string (QObject::tr ("No assignment provided for class '%s'")), cls_decl_self->name ());
   }
 
-  cls_decl_self->assign (((PYAObjectBase *) self)->obj (), ((PYAObjectBase *) args)->obj ());
+  cls_decl_self->assign (((PYAObjectBase *) self)->obj (), ((PYAObjectBase *) src)->obj ());
 
   Py_INCREF (self);
   return self;
diff --git a/testdata/python/basic.py b/testdata/python/basic.py
index fec8d53c1..285e6273c 100644
--- a/testdata/python/basic.py
+++ b/testdata/python/basic.py
@@ -118,6 +118,11 @@ class BasicTest(unittest.TestCase):
     a = pya.A.new_a(100)
     self.assertEqual( pya.A.a0(), ac0 + 1 )
 
+    a = pya.A()
+    self.assertEqual(a.a1(), 17)
+    a.assign(pya.A(110))
+    self.assertEqual(a.a1(), 110)
+
     a = None
     self.assertEqual( pya.A.a0(), ac0 )
 
diff --git a/testdata/ruby/basic_testcore.rb b/testdata/ruby/basic_testcore.rb
index d9a2c0e85..6989bffb0 100644
--- a/testdata/ruby/basic_testcore.rb
+++ b/testdata/ruby/basic_testcore.rb
@@ -3,7 +3,10 @@
 # extend A
 class RBA::A 
 
-  def initialize
+  alias_method :org_initialize, :initialize
+
+  def initialize(*args)
+    org_initialize(*args)
     @offset = nil
   end
   def s( o )
@@ -90,6 +93,11 @@ class Basic_TestClass < TestBase
     a = RBA::A.new_a(100)
     assert_equal( RBA::A::a0, ac0 + 1 )
 
+    a = RBA::A.new
+    assert_equal(a.a1, 17)
+    a.assign(RBA::A.new(110))
+    assert_equal(a.a1, 110)
+
     a = nil
     GC.start
     assert_equal( RBA::A::a0, ac0 )