diff --git a/product/ERP5Type/dynamic/portal_type_class.py b/product/ERP5Type/dynamic/portal_type_class.py
index 49d43133b51ca44eace46a3cf6195b235d8e4332..36caf7669c09b31e6f11cc93229e22ce572ca1e4 100644
--- a/product/ERP5Type/dynamic/portal_type_class.py
+++ b/product/ERP5Type/dynamic/portal_type_class.py
@@ -373,7 +373,7 @@ def initializeDynamicModules():
   erp5.temp_portal_type = registerDynamicModule('erp5.temp_portal_type',
                                                 loadTempPortalTypeClass)
 
-last_sync = 0
+last_sync = -1
 def synchronizeDynamicModules(context, force=False):
   """
   Allow resetting all classes to ghost state, most likely done after