diff --git a/tokio-threadpool/tests/threadpool.rs b/tokio-threadpool/tests/threadpool.rs
index 24eaf6337..0afd8a1c9 100644
--- a/tokio-threadpool/tests/threadpool.rs
+++ b/tokio-threadpool/tests/threadpool.rs
@@ -578,7 +578,7 @@ fn hammer() {
         }
     }
 
-    for i in 0.. ITER {
+    for _ in 0.. ITER {
         let pool = Builder::new()
             // .pool_size(30)
             .build();