diff --git a/tests/Engine/Core/SerializationTest.cpp b/tests/Engine/Core/SerializationTest.cpp
index fa7c80f27..a88dc090d 100644
--- a/tests/Engine/Core/SerializationTest.cpp
+++ b/tests/Engine/Core/SerializationTest.cpp
@@ -87,11 +87,10 @@ SCENARIO("Serialization", "[CORE][SERIALIZATION]")
 			THEN("Frustum")
 			{
 				context.stream->SetCursorPos(0);
-				Nz::Frustumf frustum;
-				frustum.Build(10, 10, 10, 100, Nz::Vector3f::UnitX(), Nz::Vector3f::UnitZ()); // Random values
+				Nz::Frustumf frustum = Nz::Frustumf::Build(10, 10, 10, 100, Nz::Vector3f::UnitX(), Nz::Vector3f::UnitZ()); // Random values
 				Nz::Frustumf copy(frustum);
 				REQUIRE(Serialize(context, frustum));
-				frustum.Build(50, 40, 20, 100, Nz::Vector3f::UnitX(), Nz::Vector3f::UnitZ());
+				frustum = Nz::Frustumf::Build(50, 40, 20, 100, Nz::Vector3f::UnitX(), Nz::Vector3f::UnitZ());
 				for (std::size_t i = 0; i < Nz::FrustumPlaneCount; ++i)
 					REQUIRE(frustum.GetPlane(static_cast<Nz::FrustumPlane>(i)) != copy.GetPlane(static_cast<Nz::FrustumPlane>(i)));
 				context.stream->SetCursorPos(0);
diff --git a/tests/Engine/Math/FrustumTest.cpp b/tests/Engine/Math/FrustumTest.cpp
index e8fffc008..4b26ebf65 100644
--- a/tests/Engine/Math/FrustumTest.cpp
+++ b/tests/Engine/Math/FrustumTest.cpp
@@ -5,8 +5,7 @@ SCENARIO("Frustum", "[MATH][FRUSTUM]")
 {
 	GIVEN("One frustum (90, 1, 1, 1000, (0, 0, 0), (1, 0, 0))")
 	{
-		Nz::Frustumf frustum;
-		frustum.Build(Nz::DegreeAnglef(90.f), 1.f, 1.f, 1000.f, Nz::Vector3f::Zero(), Nz::Vector3f::UnitX());
+		Nz::Frustumf frustum = Nz::Frustumf::Build(Nz::DegreeAnglef(90.f), 1.f, 1.f, 1000.f, Nz::Vector3f::Zero(), Nz::Vector3f::UnitX());
 
 		WHEN("We ask for intersection with objects outside the frustum")
 		{