diff --git a/libs/gfx/include/psemek/gfx/mesh.hpp b/libs/gfx/include/psemek/gfx/mesh.hpp
index 13a7af77..8cd44622 100644
--- a/libs/gfx/include/psemek/gfx/mesh.hpp
+++ b/libs/gfx/include/psemek/gfx/mesh.hpp
@@ -154,6 +154,12 @@ namespace psemek::gfx
 		static constexpr GLboolean normalized = gl::FALSE_;
 	};
 
+	template <typename T, std::size_t R, std::size_t C>
+	struct attrib_traits<geom::matrix<T, R, C>>
+	{
+		using attrib_type = geom::matrix<T, R, C>;
+	};
+
 	template <typename T>
 	struct attrib_traits<normalized<T>>
 	{
@@ -167,7 +173,7 @@ namespace psemek::gfx
 	template <typename T>
 	struct attrib_traits<instanced<T>>
 	{
-		using attrib_type = T;
+		using attrib_type = typename attrib_traits<T>::attrib_type;
 
 		static constexpr GLint size = attrib_traits<T>::size;
 		static constexpr GLenum type = attrib_traits<T>::type;