diff --git a/virttest/libvirt_xml/devices/memballoon.py b/virttest/libvirt_xml/devices/memballoon.py
index 77ddf2065c..97f87c0097 100644
--- a/virttest/libvirt_xml/devices/memballoon.py
+++ b/virttest/libvirt_xml/devices/memballoon.py
@@ -10,12 +10,14 @@
 
 class Memballoon(base.UntypedDeviceBase):
 
-    __slots__ = ('model', 'stats_period', 'address', 'alias_name',
+    __slots__ = ('model', 'autodeflate', 'stats_period', 'address', 'alias_name',
                  'driver')
 
     def __init__(self, virsh_instance=base.base.virsh):
         accessors.XMLAttribute('model', self, parent_xpath='/',
                                tag_name='memballoon', attribute='model')
+        accessors.XMLAttribute('autodeflate', self, parent_xpath='/',
+                               tag_name='memballoon', attribute='autodeflate')
         accessors.XMLAttribute('stats_period', self, parent_xpath='/',
                                tag_name='stats', attribute='period')
         accessors.XMLElementDict('address', self, parent_xpath='/',