diff --git a/src/Symfony/Contracts/Service/ServiceMethodsSubscriberTrait.php b/src/Symfony/Contracts/Service/ServiceMethodsSubscriberTrait.php
index 2c4c274f725d9..844be8907744b 100644
--- a/src/Symfony/Contracts/Service/ServiceMethodsSubscriberTrait.php
+++ b/src/Symfony/Contracts/Service/ServiceMethodsSubscriberTrait.php
@@ -53,7 +53,7 @@ public static function getSubscribedServices(): array
             $attribute = $attribute->newInstance();
             $attribute->key ??= self::class.'::'.$method->name;
             $attribute->type ??= $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;
-            $attribute->nullable = $returnType->allowsNull();
+            $attribute->nullable = $attribute->nullable ?: $returnType->allowsNull();
 
             if ($attribute->attributes) {
                 $services[] = $attribute;
diff --git a/src/Symfony/Contracts/Service/ServiceSubscriberTrait.php b/src/Symfony/Contracts/Service/ServiceSubscriberTrait.php
index f22a303b163d5..ed4cec044a831 100644
--- a/src/Symfony/Contracts/Service/ServiceSubscriberTrait.php
+++ b/src/Symfony/Contracts/Service/ServiceSubscriberTrait.php
@@ -57,7 +57,7 @@ public static function getSubscribedServices(): array
             $attribute = $attribute->newInstance();
             $attribute->key ??= self::class.'::'.$method->name;
             $attribute->type ??= $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;
-            $attribute->nullable = $returnType->allowsNull();
+            $attribute->nullable = $attribute->nullable ?: $returnType->allowsNull();
 
             if ($attribute->attributes) {
                 $services[] = $attribute;
diff --git a/src/Symfony/Contracts/Tests/Service/LegacyTestService.php b/src/Symfony/Contracts/Tests/Service/LegacyTestService.php
index 760c8efec849f..471e186f41641 100644
--- a/src/Symfony/Contracts/Tests/Service/LegacyTestService.php
+++ b/src/Symfony/Contracts/Tests/Service/LegacyTestService.php
@@ -41,8 +41,18 @@ public function aService(): Service2
         return $this->container->get(__METHOD__);
     }
 
+    #[SubscribedService(nullable: true)]
+    public function nullableInAttribute(): Service2
+    {
+        if (!$this->container->has(__METHOD__)) {
+            throw new \LogicException();
+        }
+
+        return $this->container->get(__METHOD__);
+    }
+
     #[SubscribedService]
-    public function nullableService(): ?Service2
+    public function nullableReturnType(): ?Service2
     {
         return $this->container->get(__METHOD__);
     }
diff --git a/src/Symfony/Contracts/Tests/Service/ServiceMethodsSubscriberTraitTest.php b/src/Symfony/Contracts/Tests/Service/ServiceMethodsSubscriberTraitTest.php
index 246cb6194bcec..4d67a84457c0e 100644
--- a/src/Symfony/Contracts/Tests/Service/ServiceMethodsSubscriberTraitTest.php
+++ b/src/Symfony/Contracts/Tests/Service/ServiceMethodsSubscriberTraitTest.php
@@ -25,7 +25,8 @@ public function testMethodsOnParentsAndChildrenAreIgnoredInGetSubscribedServices
     {
         $expected = [
             TestService::class.'::aService' => Service2::class,
-            TestService::class.'::nullableService' => '?'.Service2::class,
+            TestService::class.'::nullableInAttribute' => '?'.Service2::class,
+            TestService::class.'::nullableReturnType' => '?'.Service2::class,
             new SubscribedService(TestService::class.'::withAttribute', Service2::class, true, new Required()),
         ];
 
@@ -104,8 +105,18 @@ public function aService(): Service2
         return $this->container->get(__METHOD__);
     }
 
+    #[SubscribedService(nullable: true)]
+    public function nullableInAttribute(): Service2
+    {
+        if (!$this->container->has(__METHOD__)) {
+            throw new \LogicException();
+        }
+
+        return $this->container->get(__METHOD__);
+    }
+
     #[SubscribedService]
-    public function nullableService(): ?Service2
+    public function nullableReturnType(): ?Service2
     {
         return $this->container->get(__METHOD__);
     }
diff --git a/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php b/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php
index 739d693562d14..bf0db2c1e158a 100644
--- a/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php
+++ b/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php
@@ -33,7 +33,8 @@ public function testMethodsOnParentsAndChildrenAreIgnoredInGetSubscribedServices
     {
         $expected = [
             LegacyTestService::class.'::aService' => Service2::class,
-            LegacyTestService::class.'::nullableService' => '?'.Service2::class,
+            LegacyTestService::class.'::nullableInAttribute' => '?'.Service2::class,
+            LegacyTestService::class.'::nullableReturnType' => '?'.Service2::class,
             new SubscribedService(LegacyTestService::class.'::withAttribute', Service2::class, true, new Required()),
         ];
 
@@ -54,7 +55,7 @@ public function testParentNotCalledIfHasMagicCall()
         $container = new class([]) implements ContainerInterface {
             use ServiceLocatorTrait;
         };
-        $service = new class extends ParentWithMagicCall {
+        $service = new class extends LegacyParentWithMagicCall {
             use ServiceSubscriberTrait;
 
             private $container;

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