diff --git a/core/lib/Drupal/Core/Database/Database.php b/core/lib/Drupal/Core/Database/Database.php
index 35f0df5..a7ea5f2 100644
--- a/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
@@ -410,8 +410,8 @@ public static function closeConnection($target = NULL, $key = NULL) {
       unset(self::$connections[$key][$target]);
     }
     else {
-      foreach (self::$connections[$key] as $target => $connection) {
-        self::closeConnection($target, $key);
+      foreach (self::$connections[$key] as $connection_target => $connection) {
+        self::closeConnection($connection_target, $key);
       }
       unset(self::$connections[$key]);
     }