diff --git a/wapcaplet.rc b/wapcaplet.rc
index bfa3683..b8ab69e 100644
--- a/wapcaplet.rc
+++ b/wapcaplet.rc
@@ -119,10 +119,10 @@ fn smoke_test() {
 fn multithreading_test() {
     use std::task;
     use std::vec;
-    for i in range(0, 100) {
+    for i in range(0u, 100u) {
         for _ in range(0, 50) {
             do task::spawn {
-                let s = vec::from_elem(i + 1, 0).to_str();
+                let s = vec::from_elem(i + 1u, 0).to_str();
                 let s = from_rust_string(s);
                 let _t = s.clone();
             }