diff --git a/exercises/variables/variables1.rs b/exercises/variables/variables1.rs
index 4a3af73c..61d2f953 100644
--- a/exercises/variables/variables1.rs
+++ b/exercises/variables/variables1.rs
@@ -9,6 +9,7 @@
 // I AM NOT DONE
 
 fn main() {
+    let x; // This variable lacked here.
     x = 5;
     println!("x has the value {}", x);
 }