diff --git a/adminer/include/driver.inc.php b/adminer/include/driver.inc.php
index eb7f656f..61a7d395 100644
--- a/adminer/include/driver.inc.php
+++ b/adminer/include/driver.inc.php
@@ -268,7 +268,7 @@ abstract class SqlDriver {
 		// MariaDB contains CHECK_CONSTRAINTS.TABLE_NAME, MySQL and PostrgreSQL not
 		return get_key_vals("SELECT c.CONSTRAINT_NAME, CHECK_CLAUSE
 FROM INFORMATION_SCHEMA.CHECK_CONSTRAINTS c
-JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS t USING (CONSTRAINT_SCHEMA, CONSTRAINT_NAME)
+JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS t ON c.CONSTRAINT_SCHEMA = t.CONSTRAINT_SCHEMA AND c.CONSTRAINT_NAME = t.CONSTRAINT_NAME
 WHERE c.CONSTRAINT_SCHEMA = " . q($_GET["ns"] != "" ? $_GET["ns"] : DB) . "
 AND t.TABLE_NAME = " . q($table) . "
 AND CHECK_CLAUSE NOT LIKE '% IS NOT NULL'", $this->conn); // ignore default IS NOT NULL checks in PostrgreSQL