diff --git a/openVulkanoCpp/Scene/SimpleDrawable.hpp b/openVulkanoCpp/Scene/SimpleDrawable.hpp
index 321eee5..559c07f 100644
--- a/openVulkanoCpp/Scene/SimpleDrawable.hpp
+++ b/openVulkanoCpp/Scene/SimpleDrawable.hpp
@@ -11,7 +11,7 @@
 namespace OpenVulkano::Scene
 {
 	class Geometry;
-	class Material;
+	struct Material;
 
 	class SimpleDrawable final : public Drawable
 	{