diff --git a/exercises/03_ticket_v1/08_stack/src/lib.rs b/exercises/03_ticket_v1/08_stack/src/lib.rs
index e97518c..ad7d2a4 100644
--- a/exercises/03_ticket_v1/08_stack/src/lib.rs
+++ b/exercises/03_ticket_v1/08_stack/src/lib.rs
@@ -6,16 +6,16 @@ mod tests {
 
     #[test]
     fn u16_size() {
-        assert_eq!(size_of::<u16>(), todo!());
+        assert_eq!(size_of::<u16>(), 2);
     }
 
     #[test]
     fn i32_size() {
-        assert_eq!(size_of::<i32>(), todo!());
+        assert_eq!(size_of::<i32>(), 4);
     }
 
     #[test]
     fn bool_size() {
-        assert_eq!(size_of::<bool>(), todo!());
+        assert_eq!(size_of::<bool>(), 1);
     }
 }