diff --git a/addons/account/account_report.xml b/addons/account/account_report.xml
index ac6355399b8..98929af59a8 100644
--- a/addons/account/account_report.xml
+++ b/addons/account/account_report.xml
@@ -16,7 +16,8 @@
             name="account.invoice"
             rml="account/report/invoice.rml"
             string="Invoices"
-            attachment="(object.state in ('open','paid')) and (time.strftime('%Y-%m-%d')+'-'+object.number)"/>
+            attachment="(object.state in ('open','paid')) and (time.strftime('%Y-%m-%d')+'-'+object.number)"
+            attachment_use="1"/>
         <report id="account_transfers" model="account.transfer" name="account.transfer" string="Transfers" xml="account/report/transfer.xml" xsl="account/report/transfer.xsl"/>
         <report auto="False" id="account_intracom" menu="False" model="account.move.line" name="account.intracom" string="IntraCom"/>