diff --git a/os_win/tests/unit/utils/compute/test_migrationutils.py b/os_win/tests/unit/utils/compute/test_migrationutils.py
index fcd10d81..43be8470 100644
--- a/os_win/tests/unit/utils/compute/test_migrationutils.py
+++ b/os_win/tests/unit/utils/compute/test_migrationutils.py
@@ -33,7 +33,6 @@ class MigrationUtilsTestCase(test_base.OsWinBaseTestCase):
         self._migrationutils = migrationutils.MigrationUtils()
         self._migrationutils._vmutils = mock.MagicMock()
         self._migrationutils._conn_attr = mock.MagicMock()
-        self._migrationutils._compat_conn_attr = mock.MagicMock()
         self._migrationutils._jobutils = mock.MagicMock()
 
     def test_get_export_setting_data(self):
diff --git a/os_win/tests/unit/utils/test_baseutils.py b/os_win/tests/unit/utils/test_baseutils.py
index 405a560a..0e158ef3 100644
--- a/os_win/tests/unit/utils/test_baseutils.py
+++ b/os_win/tests/unit/utils/test_baseutils.py
@@ -95,6 +95,7 @@ class BaseUtilsVirtTestCase(test_base.OsWinBaseTestCase):
             mock_os]
         expected = self.utils._conn.Msvm_VirtualSystemManagementService()[0]
         self.assertEqual(expected, self.utils._vs_man_svc)
+        self.assertEqual(expected, self.utils._vs_man_svc_attr)
 
     @mock.patch.object(baseutils, 'imp')
     @mock.patch.object(baseutils, 'wmi', create=True)
@@ -108,6 +109,7 @@ class BaseUtilsVirtTestCase(test_base.OsWinBaseTestCase):
 
         expected = old_conn.Msvm_VirtualSystemManagementService()[0]
         self.assertEqual(expected, self.utils._vs_man_svc)
+        self.assertIsNone(self.utils._vs_man_svc_attr)
         mock_imp.load_source.assert_called_once_with(
             'old_wmi', '%s.py' % fake_module_path)
 
diff --git a/os_win/utils/baseutils.py b/os_win/utils/baseutils.py
index 8eee4cb1..5aa304dc 100644
--- a/os_win/utils/baseutils.py
+++ b/os_win/utils/baseutils.py
@@ -91,10 +91,16 @@ class BaseUtilsVirt(BaseUtils):
 
     @property
     def _vs_man_svc(self):
-        if not self._vs_man_svc_attr:
-            self._vs_man_svc_attr = (
-                self._compat_conn.Msvm_VirtualSystemManagementService()[0])
-        return self._vs_man_svc_attr
+        if self._vs_man_svc_attr:
+            return self._vs_man_svc_attr
+
+        vs_man_svc = self._compat_conn.Msvm_VirtualSystemManagementService()[0]
+        if BaseUtilsVirt._os_version >= [6, 3]:
+            # NOTE(claudiub): caching this property on Windows / Hyper-V Server
+            # 2012 (using the old WMI) can lead to memory leaks. PyMI doesn't
+            # have those issues, so we can safely cache it.
+            self._vs_man_svc_attr = vs_man_svc
+        return vs_man_svc
 
     def _get_wmi_compat_conn(self, moniker, **kwargs):
         # old WMI should be used on Windows / Hyper-V Server 2012 whenever