diff --git a/neutron/plugins/ml2/drivers/type_vlan.py b/neutron/plugins/ml2/drivers/type_vlan.py
index 622854cb588..d76832b84c1 100644
--- a/neutron/plugins/ml2/drivers/type_vlan.py
+++ b/neutron/plugins/ml2/drivers/type_vlan.py
@@ -130,7 +130,7 @@ class VlanTypeDriver(helpers.SegmentTypeDriver):
                                   {'vlan_id': alloc.vlan_id,
                                    'physical_network':
                                    alloc.physical_network})
-                        ctx.session.delete(alloc)
+                        alloc.delete()
 
     def get_type(self):
         return p_const.TYPE_VLAN
diff --git a/neutron/tests/unit/plugins/ml2/drivers/test_type_vlan.py b/neutron/tests/unit/plugins/ml2/drivers/test_type_vlan.py
index 6b39fc56c78..afc95b10d96 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/test_type_vlan.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/test_type_vlan.py
@@ -37,6 +37,9 @@ UPDATED_VLAN_RANGES = {
     PROVIDER_NET: [],
     TENANT_NET: [(VLAN_MIN + 5, VLAN_MAX + 5)],
 }
+EMPTY_VLAN_RANGES = {
+    PROVIDER_NET: []
+}
 CORE_PLUGIN = 'ml2'
 
 
@@ -158,6 +161,19 @@ class VlanTypeTest(testlib_api.SqlTestCase):
         self.driver._sync_vlan_allocations()
         check_in_ranges(UPDATED_VLAN_RANGES)
 
+        self.driver.network_vlan_ranges = EMPTY_VLAN_RANGES
+        self.driver._sync_vlan_allocations()
+
+        vlan_min, vlan_max = UPDATED_VLAN_RANGES[TENANT_NET][0]
+        segment = {api.NETWORK_TYPE: p_const.TYPE_VLAN,
+                   api.PHYSICAL_NETWORK: TENANT_NET}
+        segment[api.SEGMENTATION_ID] = vlan_min
+        self.assertIsNone(
+            self._get_allocation(self.context, segment))
+        segment[api.SEGMENTATION_ID] = vlan_max
+        self.assertIsNone(
+            self._get_allocation(self.context, segment))
+
     def test_reserve_provider_segment(self):
         segment = {api.NETWORK_TYPE: p_const.TYPE_VLAN,
                    api.PHYSICAL_NETWORK: PROVIDER_NET,