diff --git a/exercises/01_intro/01_syntax/src/lib.rs b/exercises/01_intro/01_syntax/src/lib.rs
index 676d81b..1845605 100644
--- a/exercises/01_intro/01_syntax/src/lib.rs
+++ b/exercises/01_intro/01_syntax/src/lib.rs
@@ -3,7 +3,7 @@
 //  partner in this course and it'll often guide you in the right direction!
 //
 // The input parameters should have the same type of the return type.
-fn compute(a, b) -> u32 {
+fn compute(a: u32, b: u32) -> u32 {
     // Don't touch the function body.
     a + b * 2
 }
@@ -16,4 +16,4 @@ mod tests {
     fn case() {
         assert_eq!(compute(1, 2), 5);
     }
-}
\ No newline at end of file
+}