diff --git a/src/Portability/Connection.php b/src/Portability/Connection.php
index 3886a58ce99..fba779325fe 100644
--- a/src/Portability/Connection.php
+++ b/src/Portability/Connection.php
@@ -2,9 +2,13 @@
 
 namespace Doctrine\DBAL\Portability;
 
+use Doctrine\Common\EventManager;
 use Doctrine\DBAL\Abstraction\Result as AbstractionResult;
 use Doctrine\DBAL\Cache\QueryCacheProfile;
 use Doctrine\DBAL\ColumnCase;
+use Doctrine\DBAL\Configuration;
+use Doctrine\DBAL\Connection as BaseConnection;
+use Doctrine\DBAL\Driver;
 use Doctrine\DBAL\Driver\PDOConnection;
 use Doctrine\DBAL\Driver\Result as DriverResult;
 use Doctrine\DBAL\Driver\Statement as DriverStatement;
@@ -17,7 +21,7 @@
 /**
  * Portability wrapper for a Connection.
  */
-class Connection extends \Doctrine\DBAL\Connection
+class Connection extends BaseConnection
 {
     public const PORTABILITY_ALL           = 255;
     public const PORTABILITY_NONE          = 0;
@@ -25,9 +29,35 @@ class Connection extends \Doctrine\DBAL\Connection
     public const PORTABILITY_EMPTY_TO_NULL = 4;
     public const PORTABILITY_FIX_CASE      = 8;
 
+    /** @var int */
+    private $portability = self::PORTABILITY_NONE;
+
+    /** @var int */
+    private $case = 0;
+
     /** @var Converter */
     private $converter;
 
+    /** {@inheritDoc} */
+    public function __construct(
+        array $params,
+        Driver $driver,
+        ?Configuration $config = null,
+        ?EventManager $eventManager = null
+    ) {
+        if (isset($params['portability'])) {
+            $this->portability = $params['portability'];
+        }
+
+        if (isset($params['fetch_case'])) {
+            $this->case = $params['fetch_case'];
+        }
+
+        unset($params['portability'], $params['fetch_case']);
+
+        parent::__construct($params, $driver, $config, $eventManager);
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -35,24 +65,19 @@ public function connect()
     {
         $ret = parent::connect();
         if ($ret) {
-            $params      = $this->getParams();
-            $portability = self::PORTABILITY_NONE;
-
-            if (isset($params['portability'])) {
-                $portability = $params['portability'] = (new OptimizeFlags())(
-                    $this->getDatabasePlatform(),
-                    $params['portability']
-                );
-            }
+            $portability = (new OptimizeFlags())(
+                $this->getDatabasePlatform(),
+                $this->portability
+            );
 
-            $case = null;
+            $case = 0;
 
-            if (isset($params['fetch_case']) && ($portability & self::PORTABILITY_FIX_CASE) !== 0) {
+            if ($this->case !== 0 && ($portability & self::PORTABILITY_FIX_CASE) !== 0) {
                 if ($this->_conn instanceof PDOConnection) {
                     // make use of c-level support for case handling
-                    $this->_conn->getWrappedConnection()->setAttribute(PDO::ATTR_CASE, $params['fetch_case']);
+                    $this->_conn->getWrappedConnection()->setAttribute(PDO::ATTR_CASE, $this->case);
                 } else {
-                    $case = $params['fetch_case'] === ColumnCase::LOWER ? CASE_LOWER : CASE_UPPER;
+                    $case = $this->case === ColumnCase::LOWER ? CASE_LOWER : CASE_UPPER;
                 }
             }