diff --git a/functions/functions2.rs b/functions/functions2.rs
index 97ed8f1..4471ccd 100644
--- a/functions/functions2.rs
+++ b/functions/functions2.rs
@@ -4,7 +4,7 @@ fn main() {
     call_me(3);
 }
 
-fn call_me(num) {
+fn call_me(num: i32) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }