diff --git a/htdocs/accountancy/customer/list.php b/htdocs/accountancy/customer/list.php
index e14d6211cbc..744584f4a20 100644
--- a/htdocs/accountancy/customer/list.php
+++ b/htdocs/accountancy/customer/list.php
@@ -313,7 +313,9 @@ $sql .= $db->plimit($limit + 1, $offset);
 dol_syslog("accountancy/customer/list.php", LOG_DEBUG);
 // MAX_JOIN_SIZE can be very low (ex: 300000) on some limited configurations (ex: https://www.online.net/fr/hosting/online-perso)
 // This big SELECT command may exceed the MAX_JOIN_SIZE limit => Therefore we use SQL_BIG_SELECTS=1 to disable the MAX_JOIN_SIZE security
-$db->query("SET SQL_BIG_SELECTS=1");
+if ($db->type == 'mysqli') {
+	$db->query("SET SQL_BIG_SELECTS=1");
+}
 $result = $db->query($sql);
 if ($result) {
 	$num_lines = $db->num_rows($result);
@@ -590,7 +592,9 @@ if ($result) {
 } else {
 	print $db->error();
 }
-$db->query("SET SQL_BIG_SELECTS=0");  // Enable MAX_JOIN_SIZE limitation
+if ($db->type == 'mysqli') {
+	$db->query("SET SQL_BIG_SELECTS=0");  // Enable MAX_JOIN_SIZE limitation
+}
 
 // Add code to auto check the box when we select an account
 print '<script type="text/javascript" language="javascript">