diff --git a/exercises/smart_pointers/rc1.rs b/exercises/smart_pointers/rc1.rs
index d62f3619..c4525942 100644
--- a/exercises/smart_pointers/rc1.rs
+++ b/exercises/smart_pointers/rc1.rs
@@ -10,7 +10,7 @@
 use std::rc::Rc;
 
 #[derive(Debug)]
-struct Sun {}
+struct Sun;
 
 #[derive(Debug)]
 enum Planet {
@@ -31,7 +31,7 @@ impl Planet {
 }
 
 fn main() {
-    let sun = Rc::new(Sun {});
+    let sun = Rc::new(Sun);
     println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
 
     let mercury = Planet::Mercury(Rc::clone(&sun));
@@ -55,17 +55,17 @@ fn main() {
     jupiter.details();
 
     // TODO
-    let saturn = Planet::Saturn(Rc::new(Sun {}));
+    let saturn = Planet::Saturn(Rc::new(Sun));
     println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
     saturn.details();
 
     // TODO
-    let uranus = Planet::Uranus(Rc::new(Sun {}));
+    let uranus = Planet::Uranus(Rc::new(Sun));
     println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
     uranus.details();
 
     // TODO
-    let neptune = Planet::Neptune(Rc::new(Sun {}));
+    let neptune = Planet::Neptune(Rc::new(Sun));
     println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
     neptune.details();