diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index ed2bcef8034..8327addc260 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -212,7 +212,7 @@ class CMailFile
 		// On defini alternative_boundary
 		$this->alternative_boundary = 'mul_'.dol_hash(uniqid("dolibarr3"), 3); // Force md5 hash (does not contains special chars)
 
-		dol_syslog("CMailFile::CMailfile: sendmode=".$this->sendmode." charset=".$conf->file->character_set_client." from=$from, to=$to, addr_cc=$addr_cc, addr_bcc=$addr_bcc, errors_to=$errors_to, replyto=$replyto trackid=$trackid sendcontext=$sendcontext", LOG_DEBUG);
+		dol_syslog("CMailFile::CMailfile: sendmode=".$this->sendmode." charset=".$conf->file->character_set_client." from=$from, to=$to, addr_cc=$addr_cc, addr_bcc=$addr_bcc, errors_to=$errors_to, replyto=$replyto trackid=$trackid sendcontext=$sendcontext upload_dir_tmp=$upload_dir_tmp", LOG_DEBUG);
 		dol_syslog("CMailFile::CMailfile: subject=".$subject.", deliveryreceipt=".$deliveryreceipt.", msgishtml=".$msgishtml, LOG_DEBUG);
 
 		if (empty($subject)) {