diff --git a/libs/cg/include/psemek/cg/body/frustum.hpp b/libs/cg/include/psemek/cg/body/frustum.hpp
index e8046412..3765ec23 100644
--- a/libs/cg/include/psemek/cg/body/frustum.hpp
+++ b/libs/cg/include/psemek/cg/body/frustum.hpp
@@ -19,6 +19,7 @@ namespace psemek::cg
 	template <typename T>
 	struct frustum<T, 3>
 	{
+		frustum() = default;
 		frustum(geom::matrix<T, 4, 4> const & m);
 
 		std::array<geom::point<T, 3>, 8> vertices;