diff --git a/src/FakePdoStatementTrait.php b/src/FakePdoStatementTrait.php
index ce33ca36..50980cb9 100644
--- a/src/FakePdoStatementTrait.php
+++ b/src/FakePdoStatementTrait.php
@@ -514,6 +514,7 @@ function ($row) use ($fetch_argument, $ctor_args) {
     /**
      * @param  int $fetch_style
      * @param  mixed      $args
+     * @return true
      */
     public function universalSetFetchMode(int $mode, ...$args) : bool
     {
diff --git a/src/Php8/FakePdoStatement.php b/src/Php8/FakePdoStatement.php
index 8156ba08..f4d1646f 100644
--- a/src/Php8/FakePdoStatement.php
+++ b/src/Php8/FakePdoStatement.php
@@ -28,7 +28,9 @@ public function fetchAll(int $fetch_style = -123, ...$args) : array
     /**
      * @param  int $fetch_style
      * @param  mixed      $args
+     * @return true
      */
+    #[\ReturnTypeWillChange]
     public function setFetchMode(int $mode, ...$args) : bool
     {
         return $this->universalSetFetchMode($mode, ...$args);
diff --git a/tests/FakePdoTest.php b/tests/FakePdoTest.php
index fc31d782..1e7bd0a1 100644
--- a/tests/FakePdoTest.php
+++ b/tests/FakePdoTest.php
@@ -28,6 +28,21 @@ public function testMinimalTransaction(): void
         self::assertFalse($pdo->inTransaction());
     }
 
+    public function testSetFetchMode(): void
+    {
+        $pdo = self::getPdo('mysql:foo;dbname=test;');
+        $pdo->prepare('CREATE TABLE `foo` (`id` INT NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci')->execute();
+        $pdo->prepare('INSERT INTO `foo` (`id`) VALUES (1)')->execute();
+
+        $statement = $pdo->prepare('SELECT `id` FROM `foo`');
+
+        self::assertTrue($statement->setFetchMode(\PDO::FETCH_ASSOC));
+
+        $statement->execute();
+
+        self::assertSame([['id' => '1']], $statement->fetchAll());
+    }
+
     /**
      * @dataProvider quotationStringProvider
      */