diff --git a/meshroom/common/core.py b/meshroom/common/core.py
index cb50d4e8..2bd6141c 100644
--- a/meshroom/common/core.py
+++ b/meshroom/common/core.py
@@ -121,9 +121,14 @@ class CoreObject(object):
         super(CoreObject, self).__init__()
         self._parent = parent
 
+    def __del__(self):
+        self.destroyed.emit()
+
     def parent(self):
         return self._parent
 
+    destroyed = PySignal.ClassSignal()
+
 
 DictModel = CoreDictModel
 ListModel = CoreListModel