diff --git a/src/tests/plane.rs b/src/tests/plane.rs
index b0e4a2b..57a480e 100644
--- a/src/tests/plane.rs
+++ b/src/tests/plane.rs
@@ -35,12 +35,12 @@ fn test_from_points() {
 #[test]
 fn test_ray_intersection() {
     let p0 = Plane::from_abcd(1f64, 0f64, 0f64, -7f64);
-    let r0 = Ray3::new(Point3::new(2f64, 3f64, 4f64), Vec3::new(1f64, 1f64, 1f64).normalize());
+    let r0: Ray3<f64> = Ray::new(Point3::new(2f64, 3f64, 4f64), Vec3::new(1f64, 1f64, 1f64).normalize());
     assert_eq!((p0, r0).intersection(), Some(Point3::new(7f64, 8f64, 9f64)));
 
     let p1 = Plane::from_points(Point3::new(5f64, 0f64,  5f64),
                                   Point3::new(5f64, 5f64,  5f64),
                                   Point3::new(5f64, 0f64, -1f64)).unwrap();
-    let r1 = Ray3::new(Point3::new(0f64, 0f64, 0f64), Vec3::new(-1f64, 0f64, 0f64).normalize());
+    let r1: Ray3<f64> = Ray::new(Point3::new(0f64, 0f64, 0f64), Vec3::new(-1f64, 0f64, 0f64).normalize());
     assert_eq!((p1, r1).intersection(), None); // r1 points away from p1
 }
diff --git a/src/tests/sphere.rs b/src/tests/sphere.rs
index 9e84081..0fc5055 100644
--- a/src/tests/sphere.rs
+++ b/src/tests/sphere.rs
@@ -8,10 +8,10 @@ use std::num;
 #[test]
 fn test_intersection() {
     let sphere = Sphere {center: Point3::new(0f64,0f64,0f64), radius: 1f64};
-    let r0 = Ray3::new(Point3::new(0f64, 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
-    let r1 = Ray3::new(Point3::new(num::cos(1f64), 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
-    let r2 = Ray3::new(Point3::new(1f64, 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
-    let r3 = Ray3::new(Point3::new(2f64, 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
+    let r0: Ray3<f64> = Ray::new(Point3::new(0f64, 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
+    let r1: Ray3<f64> = Ray::new(Point3::new(num::cos(1f64), 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
+    let r2: Ray3<f64> = Ray::new(Point3::new(1f64, 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
+    let r3: Ray3<f64> = Ray::new(Point3::new(2f64, 0f64, 5f64), Vec3::new(0f64, 0f64, -5f64).normalize());
     assert_eq!((sphere,r0).intersection(), Some(Point3::new(0f64, 0f64, 1f64)));
     assert_approx_eq!((sphere,r1).intersection().unwrap(), Point3::new(num::cos(1f64), 0f64, num::sin(1f64)));
     assert_eq!((sphere,r2).intersection(), Some(Point3::new(1f64, 0f64, 0f64)));