diff --git a/callback_dispatcher.cc b/callback_dispatcher.cc
index 0da0c91..59e6487 100644
--- a/callback_dispatcher.cc
+++ b/callback_dispatcher.cc
@@ -42,6 +42,8 @@ namespace pEp {
                 break;
             }
         }
+        if (targets.empty())
+            stop_sync();
     }
 
     void CallbackDispatcher::on_startup()