diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index db8b30ed2497a..34b7c2757e53f 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -687,7 +687,7 @@ public function sendfile()
 				$this->error = "Error in hook maildao sendMail ".$reshook;
 				dol_syslog("CMailFile::sendfile: mail end error=".$this->error, LOG_ERR);
 
-				return $reshook;
+				return false;
 			}
 			if ($reshook == 1) {	// Hook replace standard code
 				return true;