diff --git a/src/Generator/ActivityInterfaceGenerator.php b/src/Generator/ActivityInterfaceGenerator.php
index 871b2f2..50573a4 100644
--- a/src/Generator/ActivityInterfaceGenerator.php
+++ b/src/Generator/ActivityInterfaceGenerator.php
@@ -13,7 +13,7 @@ final class ActivityInterfaceGenerator implements FileGeneratorInterface
 {
     public function generate(Context $context, PhpNamespace $namespace): PhpCodePrinter
     {
-        $class = \Nette\PhpGenerator\InterfaceType::from($context->getClass());
+        $class = new \Nette\PhpGenerator\InterfaceType($context->getClass(), $namespace);
         $class->addAttribute(ActivityInterface::class, ['prefix' => $context->getBaseClass('.')]);
 
         foreach ($context->getActivityMethods() as $method) {
diff --git a/src/Generator/HandlerInterfaceGenerator.php b/src/Generator/HandlerInterfaceGenerator.php
index 31a415f..c39eda6 100644
--- a/src/Generator/HandlerInterfaceGenerator.php
+++ b/src/Generator/HandlerInterfaceGenerator.php
@@ -11,7 +11,7 @@ class HandlerInterfaceGenerator implements FileGeneratorInterface
 {
     public function generate(Context $context, PhpNamespace $namespace): PhpCodePrinter
     {
-        $class = \Nette\PhpGenerator\InterfaceType::from($context->getClass());
+        $class = new \Nette\PhpGenerator\InterfaceType($context->getClass(), $namespace);
 
         $class->addMember($handler = $context->getHandlerMethod());
         $handler->setReturnType(RunningWorkflow::class);
diff --git a/src/Generator/WorkflowInterfaceGenerator.php b/src/Generator/WorkflowInterfaceGenerator.php
index 787fc7d..cae4994 100644
--- a/src/Generator/WorkflowInterfaceGenerator.php
+++ b/src/Generator/WorkflowInterfaceGenerator.php
@@ -16,7 +16,7 @@ public function generate(Context $context, PhpNamespace $namespace): PhpCodePrin
     {
         $className = $context->getClass();
 
-        $class = \Nette\PhpGenerator\InterfaceType::from($className);
+        $class = new \Nette\PhpGenerator\InterfaceType($className, $namespace);
 
         $class->addAttribute(WorkflowInterface::class);