diff --git a/sync/views.py b/sync/views.py
index 666760e..5b78e1c 100644
--- a/sync/views.py
+++ b/sync/views.py
@@ -270,7 +270,7 @@ class SynchronizationApi(HierarchyApiView):
     def query_model_logs(self, last_update, user, device_id):
         log_query = Q(date__gt=last_update, users=user)
         if device_id:
-            log_query &= Q(device_id=device_id)
+            log_query &= ~Q(device_id=device_id) # exclude query
         return ModelLog.objects.filter(log_query).order_by('date')
 
 class UserDataAccessApi(HierarchyApiView):