diff --git a/product/ERP5Catalog/Tool/ArchiveTool.py b/product/ERP5Catalog/Tool/ArchiveTool.py
index f5f4b07354c1f275ebca7de033882843a8a11d79..75ef250fc7e81c1249d7f79bc2bacfeb2c9237f7 100755
--- a/product/ERP5Catalog/Tool/ArchiveTool.py
+++ b/product/ERP5Catalog/Tool/ArchiveTool.py
@@ -211,7 +211,7 @@ class ArchiveTool(BaseTool):
                                              REQUEST=REQUEST, RESPONSE=RESPONSE)
 
     # Create inventory just before finish of hot reindexing
-    inventory_date = str(archive.getStopDateRangeMax())
+    inventory_date = archive.getStopDateRangeMax()
     self.activate(passive_commit=1,
                   after_method_id=('playBackRecordedObjectList'),
                   priority=5).runInventoryMethod(archive.id,