diff --git a/.gitignore b/.gitignore
index 9787040..cd9e7b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 /vendor
 /build
 /.phpunit.result.cache
+/.phpunit.cache
 tags
diff --git a/src/Annotations/Validate.php b/src/Annotations/Validate.php
index 3b2487f..45312b8 100644
--- a/src/Annotations/Validate.php
+++ b/src/Annotations/Validate.php
@@ -6,7 +6,6 @@
 
 use Attribute;
 use BadMethodCallException;
-use TheCodingMachine\GraphQLite\Annotations\MiddlewareAnnotationInterface;
 use TheCodingMachine\GraphQLite\Annotations\ParameterAnnotationInterface;
 use function is_string;
 use function ltrim;
@@ -30,7 +29,7 @@ class Validate implements ParameterAnnotationInterface
     private $rule;
 
     /**
-     * @param array<string, mixed> $values
+     * @param array<string, mixed>|string $rule
      */
     public function __construct($rule = [])
     {
@@ -43,7 +42,7 @@ public function __construct($rule = [])
                 $this->for = ltrim($values['for'], '$');
             }
         }
-        if (! isset($values['rule'])) {
+        if (empty($this->rule)) {
             throw new BadMethodCallException('The @Validate annotation must be passed a rule. For instance: "#Validate("email")" in PHP 8+ or "@Validate(for="$email", rule="email")" in PHP 7+');
         }
     }
diff --git a/tests/Annotations/ValidateTest.php b/tests/Annotations/ValidateTest.php
new file mode 100644
index 0000000..b85e0dc
--- /dev/null
+++ b/tests/Annotations/ValidateTest.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace TheCodingMachine\GraphQLite\Laravel\Providers;
+
+use BadMethodCallException;
+use Orchestra\Testbench\TestCase;
+use TheCodingMachine\GraphQLite\Laravel\Annotations\Validate;
+
+class ValidateTest extends TestCase
+{
+    public function testStringArgument(): void
+    {
+        $validator = new Validate('any-rule');
+        $this->assertEquals('any-rule', $validator->getRule());
+    }
+
+    public function testArrayArgument(): void
+    {
+        $validator = new Validate(['rule' => 'any-rule']);
+        $this->assertEquals('any-rule', $validator->getRule());
+    }
+
+    public function testArrayArgumentWithRuleAndForProperties(): void
+    {
+        $validator = new Validate([
+            'rule' => 'any-rule',
+            'for' => 'any-for',
+        ]);
+        $this->assertEquals('any-rule', $validator->getRule());
+        $this->assertEquals('any-for', $validator->getTarget());
+    }
+
+    public function testRuleShouldNotBeEmpty(): void
+    {
+        $this->expectException(BadMethodCallException::class);
+        $validator = new Validate('');
+    }
+}
diff --git a/tests/Fixtures/App/Http/Controllers/TestController.php b/tests/Fixtures/App/Http/Controllers/TestController.php
index a68f602..0b68627 100644
--- a/tests/Fixtures/App/Http/Controllers/TestController.php
+++ b/tests/Fixtures/App/Http/Controllers/TestController.php
@@ -55,4 +55,14 @@ public function testValidatorMultiple(string $foo): string
     {
         return 'success';
     }
+
+    /** @Query() */
+    public function testValidatorForParameterPHP8(
+        #[Validate("required")]
+        string $foo,
+        #[Validate("sometimes")]
+        null|string $bar,
+    ): string {
+        return 'success';
+    }
 }
diff --git a/tests/Providers/GraphQLiteServiceProviderTest.php b/tests/Providers/GraphQLiteServiceProviderTest.php
index 2c1e2a1..b8ca1f9 100644
--- a/tests/Providers/GraphQLiteServiceProviderTest.php
+++ b/tests/Providers/GraphQLiteServiceProviderTest.php
@@ -10,14 +10,11 @@
 use TheCodingMachine\GraphQLite\Http\HttpCodeDeciderInterface;
 use TheCodingMachine\GraphQLite\Laravel\Listeners\CachePurger;
 use TheCodingMachine\GraphQLite\Schema;
-use TheCodingMachine\TDBM\TDBMService;
-use function json_decode;
 use Illuminate\Http\Request;
 use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;
 use TheCodingMachine\GraphQLite\Laravel\Controllers\GraphQLiteController;
 use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
 
-
 class GraphQLiteServiceProviderTest extends TestCase
 {
     protected function getPackageProviders($app)
@@ -168,6 +165,32 @@ public function testValidatorMultiple()
         $this->assertSame(200, $response->getStatusCode(), $response->getContent());
     }
 
+    /**
+     * This test the 'Validate' Attribute. In older versions the 'rule' property
+     * of the Validate constructor was normalized but wrong value was checked.
+     * Now the Validate attribute should works properly if it's initialized
+     * with something like this: "#[Validate('some-rule')]".
+     */
+    public function testValidatorForParameterPHP8()
+    {
+        $response = $this->json('POST', '/graphql', ['query' => '{ testValidatorForParameterPHP8(foo:"") }']);
+        $response->assertJson([
+            'errors' => [
+                [
+                    'extensions' => [
+                        'argument' => 'foo',
+                    ],
+                ],
+            ],
+        ]);
+
+        $this->assertStringContainsString('The foo field is required.', $response->json('errors')[0]['message']);
+        $this->assertSame(400, $response->getStatusCode(), $response->getContent());
+
+        $response = $this->json('POST', '/graphql', ['query' => '{ testValidatorForParameterPHP8(foo:"not-empty") }']);
+        $this->assertSame(200, $response->getStatusCode(), $response->getContent());
+    }
+
     public function testCachePurger(): void
     {
         $cachePurger = $this->app->make(CachePurger::class);