diff --git a/core/lib/Drupal/Core/Database/Connection.php b/core/lib/Drupal/Core/Database/Connection.php
index 70cb296..ead1d85 100644
--- a/core/lib/Drupal/Core/Database/Connection.php
+++ b/core/lib/Drupal/Core/Database/Connection.php
@@ -147,7 +147,7 @@
    */
   public function __construct(PDO $connection, array $connection_options) {
     // Initialize and prepare the connection prefix.
-    $this->setPrefix(isset($this->connectionOptions['prefix']) ? $this->connectionOptions['prefix'] : '');
+    $this->setPrefix(isset($connection_options['prefix']) ? $connection_options['prefix'] : '');
 
     // Set a Statement class, unless the driver opted out.
     if (!empty($this->statementClass)) {