diff --git a/stubs/Symfony/Component/Form/AbstractType.stub b/stubs/Symfony/Component/Form/AbstractType.stub
index e99b746c..fab514d5 100644
--- a/stubs/Symfony/Component/Form/AbstractType.stub
+++ b/stubs/Symfony/Component/Form/AbstractType.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  *
  * @implements FormTypeInterface<TData>
  */
diff --git a/stubs/Symfony/Component/Form/FormBuilderInterface.stub b/stubs/Symfony/Component/Form/FormBuilderInterface.stub
index fe578c50..1ccf9a12 100644
--- a/stubs/Symfony/Component/Form/FormBuilderInterface.stub
+++ b/stubs/Symfony/Component/Form/FormBuilderInterface.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  *
  * @extends \Traversable<int, \Symfony\Component\Form\FormBuilderInterface<mixed>>
  * @extends FormConfigBuilderInterface<TData>
diff --git a/stubs/Symfony/Component/Form/FormConfigBuilderInterface.stub b/stubs/Symfony/Component/Form/FormConfigBuilderInterface.stub
index a167ce43..8acda35f 100644
--- a/stubs/Symfony/Component/Form/FormConfigBuilderInterface.stub
+++ b/stubs/Symfony/Component/Form/FormConfigBuilderInterface.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  *
  * @extends FormConfigInterface<TData>
  */
diff --git a/stubs/Symfony/Component/Form/FormConfigInterface.stub b/stubs/Symfony/Component/Form/FormConfigInterface.stub
index 942d467b..02183ee2 100644
--- a/stubs/Symfony/Component/Form/FormConfigInterface.stub
+++ b/stubs/Symfony/Component/Form/FormConfigInterface.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  */
 interface FormConfigInterface
 {
diff --git a/stubs/Symfony/Component/Form/FormInterface.stub b/stubs/Symfony/Component/Form/FormInterface.stub
index 4bd21229..711bae2d 100644
--- a/stubs/Symfony/Component/Form/FormInterface.stub
+++ b/stubs/Symfony/Component/Form/FormInterface.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  *
  * @extends \ArrayAccess<string, \Symfony\Component\Form\FormInterface<mixed>>
  * @extends \Traversable<string, \Symfony\Component\Form\FormInterface<mixed>>
diff --git a/stubs/Symfony/Component/Form/FormTypeExtensionInterface.stub b/stubs/Symfony/Component/Form/FormTypeExtensionInterface.stub
index a03d5e1c..86b0943b 100644
--- a/stubs/Symfony/Component/Form/FormTypeExtensionInterface.stub
+++ b/stubs/Symfony/Component/Form/FormTypeExtensionInterface.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  */
 interface FormTypeExtensionInterface
 {
diff --git a/stubs/Symfony/Component/Form/FormTypeInterface.stub b/stubs/Symfony/Component/Form/FormTypeInterface.stub
index 8536656a..4bacce44 100644
--- a/stubs/Symfony/Component/Form/FormTypeInterface.stub
+++ b/stubs/Symfony/Component/Form/FormTypeInterface.stub
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Form;
 
 /**
- * @template TData
+ * @template TData = mixed
  */
 interface FormTypeInterface
 {