diff --git a/ovsdbapp/backend/ovs_idl/connection.py b/ovsdbapp/backend/ovs_idl/connection.py
index b370435f..d231609a 100644
--- a/ovsdbapp/backend/ovs_idl/connection.py
+++ b/ovsdbapp/backend/ovs_idl/connection.py
@@ -209,13 +209,25 @@ class OvsdbIdl(idl.Idl):
 
         schema = schema_helper.get_idl_schema()
         self._db = schema
-        self.tables = schema.tables
-        for table in schema.tables.values():
+        removed = self.tables.keys() - schema.tables.keys()
+        added = schema.tables.keys() - self.tables.keys()
+
+        # stop monitoring removed tables
+        for table in removed:
+            self.cond_change(table, [False])
+            del self.tables[table]
+
+        # add new tables as Idl.__init__ does
+        for table in (schema.tables[table] for table in added):
+            self.tables[table.name] = table
             for column in table.columns.values():
                 if not hasattr(column, 'alert'):
                     column.alert = True
             table.need_table = False
             table.rows = custom_index.IndexedRows(table)
             table.idl = self
-            table.condition = [True]
+            try:
+                table.condition = idl.ConditionState()
+            except AttributeError:
+                table.condition = [True]
             table.cond_changed = False
diff --git a/ovsdbapp/tests/functional/backend/ovs_idl/test_connection.py b/ovsdbapp/tests/functional/backend/ovs_idl/test_connection.py
index 41749e8d..00d226c4 100644
--- a/ovsdbapp/tests/functional/backend/ovs_idl/test_connection.py
+++ b/ovsdbapp/tests/functional/backend/ovs_idl/test_connection.py
@@ -64,6 +64,9 @@ class TestOvsdbIdl(base.FunctionalTestCase):
         for table in tables:
             valid_func(table, self.idl.tables)
 
+        # ensure that the Idl still works after we update the tables
+        self.idl.run()
+
     def test_add_new_table(self):
         tables = ["Port", "Interface"]