diff --git a/exercises/02_basic_calculator/01_integers/src/lib.rs b/exercises/02_basic_calculator/01_integers/src/lib.rs
index 555db12..1ba5faa 100644
--- a/exercises/02_basic_calculator/01_integers/src/lib.rs
+++ b/exercises/02_basic_calculator/01_integers/src/lib.rs
@@ -1,6 +1,6 @@
 fn compute(a: u32, b: u32) -> u32 {
     // TODO: change the line below to fix the compiler error and make the tests pass.
-    a + b * 4u8
+    a + b * 4u32
 }
 
 #[cfg(test)]