diff --git a/htdocs/opensurvey/fonctions.php b/htdocs/opensurvey/fonctions.php
index 214fc9130db..d194646140c 100644
--- a/htdocs/opensurvey/fonctions.php
+++ b/htdocs/opensurvey/fonctions.php
@@ -190,7 +190,7 @@ function dol_survey_random($car)
 {
 	$string = "";
 	$chaine = "abcdefghijklmnopqrstuvwxyz123456789";
-	srand((double) microtime()*1000000);
+	mt_srand((double) microtime()*1000000);
 	for($i=0; $i<$car; $i++) {
 		$string .= $chaine[mt_rand() % strlen($chaine)];
 	}