diff --git a/Classes/Core/Testbase.php b/Classes/Core/Testbase.php
index 45244563..d1cfa339 100644
--- a/Classes/Core/Testbase.php
+++ b/Classes/Core/Testbase.php
@@ -473,7 +473,7 @@ public function getOriginalDatabaseSettingsFromEnvironmentOrLocalConfiguration(a
                 $originalConfigurationArray['DB']['Connections']['Default']['password'] = $databasePasswordTrimmed;
             }
             if ($databasePort) {
-                $originalConfigurationArray['DB']['Connections']['Default']['port'] = $databasePort;
+                $originalConfigurationArray['DB']['Connections']['Default']['port'] = (int)$databasePort;
             }
             if ($databaseSocket) {
                 $originalConfigurationArray['DB']['Connections']['Default']['unix_socket'] = $databaseSocket;