diff --git a/examples/raytracer.psl b/examples/raytracer.psl
index 4ae9416..09dcb53 100644
--- a/examples/raytracer.psl
+++ b/examples/raytracer.psl
@@ -504,11 +504,11 @@ func intersect_box(ray: ray, object: object*) -> intersection:
 	mut tzmax = (  (*shape).extent.z - local_delta.z) / local_direction.z
 
 	if txmin > txmax:
-		swap(&txmin, &txmax)
+		swap(&mut txmin, &mut txmax)
 	if tymin > tymax:
-		swap(&tymin, &tymax)
+		swap(&mut tymin, &mut tymax)
 	if tzmin > tzmax:
-		swap(&tzmin, &tzmax)
+		swap(&mut tzmin, &mut tzmax)
 
 	let tmin = max(txmin, max(tymin, tzmin))
 	let tmax = min(txmax, min(tymax, tzmax))
@@ -656,7 +656,7 @@ struct thread:
 func create_thread(thread_func: unit mut* -> unit, thread_data: unit mut*) -> thread:
 	foreign func pthread_create(thread: thread mut*, attr: unit*, start_routine: unit mut* -> unit, arg: unit mut*) -> i32
 	mut result = thread()
-	pthread_create(&result, 0ul as unit*, thread_func, thread_data)
+	pthread_create(&mut result, 0ul as unit*, thread_func, thread_data)
 	return result
 
 func join_thread(thread: thread):
@@ -702,7 +702,7 @@ func make_default_scene() -> scene:
 		objects[0].material.color = vec3(0.6, 0.6, 0.6)
 		objects[0].material.emission = vec3(0.0, 0.0, 0.0)
 		objects[0].material.type = diffuse_tag
-		set_plane(&objects[0], plane())
+		set_plane(&mut objects[0], plane())
 
 		// Ceiling
 		objects[1].position = vec3(0.0, 5.0, 0.0)
@@ -710,7 +710,7 @@ func make_default_scene() -> scene:
 		objects[1].material.color = vec3(0.6, 0.6, 0.6)
 		objects[1].material.emission = vec3(0.0, 0.0, 0.0)
 		objects[1].material.type = diffuse_tag
-		set_plane(&objects[1], plane())
+		set_plane(&mut objects[1], plane())
 
 		// Left wall
 		objects[2].position = vec3(-5.0, 0.0, 0.0)
@@ -718,7 +718,7 @@ func make_default_scene() -> scene:
 		objects[2].material.color = vec3(1.0, 0.2, 0.2)
 		objects[2].material.emission = vec3(0.0, 0.0, 0.0)
 		objects[2].material.type = diffuse_tag
-		set_plane(&objects[2], plane())
+		set_plane(&mut objects[2], plane())
 
 		// Right wall
 		objects[3].position = vec3(5.0, 0.0, 0.0)
@@ -726,7 +726,7 @@ func make_default_scene() -> scene:
 		objects[3].material.color = vec3(0.2, 0.2, 1.0)
 		objects[3].material.emission = vec3(0.0, 0.0, 0.0)
 		objects[3].material.type = diffuse_tag
-		set_plane(&objects[3], plane())
+		set_plane(&mut objects[3], plane())
 
 		// Back wall
 		objects[4].position = vec3(0.0, 0.0, -5.0)
@@ -734,7 +734,7 @@ func make_default_scene() -> scene:
 		objects[4].material.color = vec3(0.6, 0.6, 0.6)
 		objects[4].material.emission = vec3(0.0, 0.0, 0.0)
 		objects[4].material.type = diffuse_tag
-		set_plane(&objects[4], plane())
+		set_plane(&mut objects[4], plane())
 
 	func fill_objects(objects: object mut*):
 		// Top lamp
@@ -743,7 +743,7 @@ func make_default_scene() -> scene:
 		objects[5].material.color = vec3(0.0, 0.0, 0.0)
 		objects[5].material.emission = vec3(20.0, 16.0, 12.0)
 		objects[5].material.type = diffuse_tag
-		set_sphere(&objects[5], sphere(5.25))
+		set_sphere(&mut objects[5], sphere(5.25))
 
 		// Box
 		objects[6].position = vec3(-2.25, -2.0, -1.0)
@@ -753,7 +753,7 @@ func make_default_scene() -> scene:
 		objects[6].material.type = glass_tag
 		objects[6].material.roughness = 0.0
 		objects[6].material.ior = 1.333
-		set_box(&objects[6], box(vec3(1.5, 3.0, 1.5)))
+		set_box(&mut objects[6], box(vec3(1.5, 3.0, 1.5)))
 
 		// Sphere
 		objects[7].position = vec3(2.5, -3.0, -1.0)
@@ -762,7 +762,7 @@ func make_default_scene() -> scene:
 		objects[7].material.emission = vec3(0.0, 0.0, 0.0)
 		objects[7].material.type = metallic_tag
 		objects[7].material.roughness = 0.5
-		set_sphere(&objects[7], sphere(2.0))
+		set_sphere(&mut objects[7], sphere(2.0))
 	
 	fill_walls(objects)
 	fill_objects(objects)
diff --git a/libs/types/include/pslang/types/pointer.hpp b/libs/types/include/pslang/types/pointer.hpp
index c5210d9..4abae45 100644
--- a/libs/types/include/pslang/types/pointer.hpp
+++ b/libs/types/include/pslang/types/pointer.hpp
@@ -12,7 +12,7 @@ namespace pslang::types
 
 		friend bool operator == (pointer_type const & t1, pointer_type const & t2)
 		{
-			return equal(*t1.referenced_type, *t2.referenced_type);
+			return equal(*t1.referenced_type, *t2.referenced_type) && (t1.is_mutable == t2.is_mutable);
 		}
 	};