diff --git a/htdocs/comm/prospect/prospects.php b/htdocs/comm/prospect/prospects.php
index b93c71118fe..e559a89023b 100644
--- a/htdocs/comm/prospect/prospects.php
+++ b/htdocs/comm/prospect/prospects.php
@@ -78,9 +78,20 @@ if ($_GET["action"] == 'cstc')
 $sql = "SELECT s.idp, s.nom, s.ville, ".$db->pdate("s.datec")." as datec, ".$db->pdate("s.datea")." as datea,  st.libelle as stcomm, s.prefix_comm, s.fk_stcomm ";
 $sql .= ", d.nom as departement";
 if (!$user->rights->commercial->client->voir && !$socidp) $sql .= ", sc.fk_soc, sc.fk_user";
-$sql .= " FROM ".MAIN_DB_PREFIX."c_stcomm as st, ".MAIN_DB_PREFIX."societe as s";
-if (!$user->rights->commercial->client->voir && !$socidp) $sql .= ", ".MAIN_DB_PREFIX."societe_commerciaux as sc";
-$sql .= " LEFT join ".MAIN_DB_PREFIX."c_departements as d on d.rowid = s.fk_departement";
+$sql .= " FROM (".MAIN_DB_PREFIX."c_stcomm as st, ".MAIN_DB_PREFIX."societe as s";
+
+// Avec MySQL 5.0 la procédure de requêtes jointes (JOIN) a changé pour suivre les standards plus correctement.
+// référence: http://dev.mysql.com/doc/refman/5.0/fr/join.html
+if (!$user->rights->commercial->client->voir && !$socidp)
+{
+	$sql .= ", ".MAIN_DB_PREFIX."societe_commerciaux as sc)";
+}
+else
+{
+	$sql .=")";
+}
+
+$sql .= " LEFT join ".MAIN_DB_PREFIX."c_departements as d on (d.rowid = s.fk_departement)";
 $sql .= " WHERE s.fk_stcomm = st.id AND s.client=2";
 if (!$user->rights->commercial->client->voir && !$socidp) $sql .= " AND s.idp = sc.fk_soc AND sc.fk_user = " .$user->id;