diff --git a/core/modules/sqlite/src/Driver/Database/sqlite/PDOConnection.php b/core/modules/sqlite/src/Driver/Database/sqlite/PDOConnection.php
index c12b8bf7bf..4a03d6172a 100644
--- a/core/modules/sqlite/src/Driver/Database/sqlite/PDOConnection.php
+++ b/core/modules/sqlite/src/Driver/Database/sqlite/PDOConnection.php
@@ -15,21 +15,21 @@ class PDOConnection extends \PDO {
   /**
    * {@inheritdoc}
    */
-  public function beginTransaction() {
+  public function beginTransaction(): bool {
     return $this->exec('BEGIN IMMEDIATE TRANSACTION') !== FALSE;
   }
 
   /**
    * {@inheritdoc}
    */
-  public function commit() {
+  public function commit(): bool {
     return $this->exec('COMMIT') !== FALSE;
   }
 
   /**
    * {@inheritdoc}
    */
-  public function rollBack() {
+  public function rollBack(): bool {
     return $this->exec('ROLLBACK') !== FALSE;
   }