diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php b/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
index 164f68a..e5ef745 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
@@ -71,7 +71,7 @@ public function __construct(\PDO $connection, array $connection_options = []) {
     parent::__construct($connection, $connection_options);
 
     // This driver defaults to transaction support, except if explicitly passed FALSE.
-    $this->transactionSupport = !isset($connection_options['transactions']) || ($connection_options['transactions'] !== FALSE);
+    $this->transactionSupport = FALSE;
 
     // MySQL never supports transactional DDL.
     $this->transactionalDDLSupport = FALSE;
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
index 3769e54..207f791 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
@@ -76,7 +76,7 @@ public function __construct(\PDO $connection, array $connection_options) {
     parent::__construct($connection, $connection_options);
 
     // This driver defaults to transaction support, except if explicitly passed FALSE.
-    $this->transactionSupport = !isset($connection_options['transactions']) || ($connection_options['transactions'] !== FALSE);
+    $this->transactionSupport = FALSE;
 
     // Transactional DDL is always available in PostgreSQL,
     // but we'll only enable it if standard transactions are.
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
index a14a83f..09a284c 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
@@ -66,7 +66,7 @@ public function __construct(\PDO $connection, array $connection_options) {
     parent::__construct($connection, $connection_options);
 
     // This driver defaults to transaction support, except if explicitly passed FALSE.
-    $this->transactionSupport = $this->transactionalDDLSupport = !isset($connection_options['transactions']) || $connection_options['transactions'] !== FALSE;
+    $this->transactionSupport = FALSE;
 
     $this->connectionOptions = $connection_options;