diff --git a/build/PHPStan/Build/ServiceLocatorDynamicReturnTypeExtension.php b/build/PHPStan/Build/ServiceLocatorDynamicReturnTypeExtension.php
index 51874b7a23..22812240f4 100644
--- a/build/PHPStan/Build/ServiceLocatorDynamicReturnTypeExtension.php
+++ b/build/PHPStan/Build/ServiceLocatorDynamicReturnTypeExtension.php
@@ -9,7 +9,7 @@
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
 
-class ServiceLocatorDynamicReturnTypeExtension implements \PHPStan\Type\DynamicMethodReturnTypeExtension
+final class ServiceLocatorDynamicReturnTypeExtension implements \PHPStan\Type\DynamicMethodReturnTypeExtension
 {
 
 	public function getClass(): string
diff --git a/src/Type/Php/AbsFunctionDynamicReturnTypeExtension.php b/src/Type/Php/AbsFunctionDynamicReturnTypeExtension.php
index d47d7f39eb..5ce81dbe84 100644
--- a/src/Type/Php/AbsFunctionDynamicReturnTypeExtension.php
+++ b/src/Type/Php/AbsFunctionDynamicReturnTypeExtension.php
@@ -9,7 +9,7 @@
 use PHPStan\Type\ErrorType;
 use PHPStan\Type\Type;
 
-class AbsFunctionDynamicReturnTypeExtension implements DynamicFunctionReturnTypeExtension
+final class AbsFunctionDynamicReturnTypeExtension implements DynamicFunctionReturnTypeExtension
 {
 
 	public function isFunctionSupported(FunctionReflection $functionReflection): bool