diff --git a/tests/orbit_test.cpp b/tests/orbit_test.cpp
index bd99ccd..5017e85 100644
--- a/tests/orbit_test.cpp
+++ b/tests/orbit_test.cpp
@@ -82,12 +82,12 @@ TEST_CASE("orbital elements to state vectors, example 3.2", "[orbits]")
 	REQUIRE_THAT(M[2][2], WithinAbs( 0.4478, 1e-4));
 
 	// rotate perifocal state vectors to IJK coordinates
-	glm::vec3 r_pos = M * pos;
+	glm::dvec3 r_pos = M * pos;
 	REQUIRE_THAT(r_pos.x, WithinAbs(-4394.0, 0.2));
 	REQUIRE_THAT(r_pos.y, WithinAbs( 1410.3, 0.1));
 	REQUIRE_THAT(r_pos.z, WithinAbs(-5647.7, 0.1));
 
-	glm::vec3 r_vel = M * vel;
+	glm::dvec3 r_vel = M * vel;
 	REQUIRE_THAT(r_vel.x, WithinAbs(-8.2715, 0.1));
 	REQUIRE_THAT(r_vel.y, WithinAbs(-4.3852, 0.1));
 	REQUIRE_THAT(r_vel.z, WithinAbs( 2.5794, 0.1));