diff --git a/trytond/trytond/model/modelview.py b/trytond/trytond/model/modelview.py
index 17740144d9..1950299203 100644
--- a/trytond/trytond/model/modelview.py
+++ b/trytond/trytond/model/modelview.py
@@ -863,6 +863,8 @@ class ModelView(Model):
                 targets = value
                 if fname in init_values:
                     init_targets = init_values._get(fname)
+                elif isinstance(field, fields.Function):
+                    init_targets = []
                 else:
                     init_targets = getattr(init_record, fname, [])
                 value = collections.defaultdict(list)
diff --git a/trytond/trytond/tests/modelview.py b/trytond/trytond/tests/modelview.py
index 9b57187099..236071ab24 100644
--- a/trytond/trytond/tests/modelview.py
+++ b/trytond/trytond/tests/modelview.py
@@ -25,6 +25,12 @@ class ModelViewChangedValues(ModelView):
             ], "MultiSelection")
     dictionary = fields.Dict(
         'test.modelview.changed_values.dictionary', "Dictionary")
+    m2m_function = fields.Function(fields.Many2Many(
+            'test.modelview.changed_values.target', None, None, "Targets"),
+        'on_change_with_m2m_function')
+
+    def on_change_with_m2m_function(self, name=None):
+        return
 
 
 class ModelViewChangedValuesDictSchema(DictSchemaMixin, ModelSQL):
diff --git a/trytond/trytond/tests/test_modelview.py b/trytond/trytond/tests/test_modelview.py
index 4a0d5dad48..d11e2aa5d9 100644
--- a/trytond/trytond/tests/test_modelview.py
+++ b/trytond/trytond/tests/test_modelview.py
@@ -109,6 +109,22 @@ class ModelView(unittest.TestCase):
                     },
                 })
 
+    @with_transaction()
+    def test_changed_values_2many_function(self):
+        "Test changed values for xxx2many function field"
+        pool = Pool()
+        Model = pool.get('test.modelview.changed_values')
+
+        with patch.object(
+                Model, 'on_change_with_m2m_function') as on_change_with:
+            on_change_with.return_value = [42]
+            record = Model()
+            record.m2m_function = record.on_change_with_m2m_function()
+
+            self.assertEqual(record._changed_values, {
+                    'm2m_function': {'add': [(0, {'id': 42})]},
+                    })
+
     @with_transaction()
     def test_changed_values_stored(self):
         "Test stored changed values"