diff --git a/python/plugins/db_manager/db_plugins/oracle/plugin.py b/python/plugins/db_manager/db_plugins/oracle/plugin.py
index a44dc361c6a..b2da5f45c4c 100644
--- a/python/plugins/db_manager/db_plugins/oracle/plugin.py
+++ b/python/plugins/db_manager/db_plugins/oracle/plugin.py
@@ -527,7 +527,7 @@ class ORTableField(TableField):
 
     def update(self, new_name, new_type_str=None, new_not_null=None,
                new_default_str=None):
-        self.table().aboutToChange()
+        self.table().aboutToChange.emit()
         if self.name == new_name:
             new_name = None
         if self.type2String() == new_type_str:
diff --git a/python/plugins/db_manager/db_plugins/postgis/plugin.py b/python/plugins/db_manager/db_plugins/postgis/plugin.py
index d12160618df..bc3f248d6fe 100644
--- a/python/plugins/db_manager/db_plugins/postgis/plugin.py
+++ b/python/plugins/db_manager/db_plugins/postgis/plugin.py
@@ -184,7 +184,7 @@ class PGTable(Table):
         self.schema().refresh() if self.schema() else self.database().refresh()
 
     def runRefreshMaterializedView(self):
-        self.aboutToChange()
+        self.aboutToChange.emit()
         self.database().connector.runRefreshMaterializedView((self.schemaName(), self.name))
         # TODO: change only this item, not re-create all the tables in the schema/database
         self.schema().refresh() if self.schema() else self.database().refresh()