diff --git a/product/ERP5SyncML/XMLSyncUtils.py b/product/ERP5SyncML/XMLSyncUtils.py
index 367e76d1e3f2d3c875b09fbb1f6cae5618d9070c..ccf6aa7f27dbe27991809773b2be8255bcf068d6 100755
--- a/product/ERP5SyncML/XMLSyncUtils.py
+++ b/product/ERP5SyncML/XMLSyncUtils.py
@@ -223,7 +223,7 @@ class XMLSyncUtilsMixin(SyncCode):
     elif hasattr(object,'manage_FTPget'):
       xml_method = getattr(object,'manage_FTPget')
     if xml_method is not None:
-      xml += xml_method()
+      xml = xml_method()
     return xml
 
   def getSessionId(self, xml):