diff --git a/exercises/02_basic_calculator/02_variables/src/lib.rs b/exercises/02_basic_calculator/02_variables/src/lib.rs
index e8d1167..8e5de3f 100644
--- a/exercises/02_basic_calculator/02_variables/src/lib.rs
+++ b/exercises/02_basic_calculator/02_variables/src/lib.rs
@@ -8,7 +8,7 @@
 pub fn speed(start: u32, end: u32, time_elapsed: u32) -> u32 {
     // TODO: define a variable named `distance` with the right value to get tests to pass
     //  Do you need to annotate the type of `distance`? Why or why not?
-
+    let distance: u32 = end - start;
     // Don't change the line below
     distance / time_elapsed
 }