diff --git a/futures/tests/join_all.rs b/futures/tests/join_all.rs
index 1450679f3e..c322e58a13 100644
--- a/futures/tests/join_all.rs
+++ b/futures/tests/join_all.rs
@@ -37,7 +37,7 @@ fn join_all_iter_lifetime() {
         Box::new(join_all(iter))
     }
 
-    util::assert_done(|| sizes(vec![&[1,2,3], &[], &[0]]), vec![3 as usize, 0, 1]);
+    util::assert_done(|| sizes(vec![&[1,2,3], &[], &[0]]), vec![3_usize, 0, 1]);
 }
 
 #[test]
diff --git a/futures/tests/try_join_all.rs b/futures/tests/try_join_all.rs
index 3de679b034..8e579a2800 100644
--- a/futures/tests/try_join_all.rs
+++ b/futures/tests/try_join_all.rs
@@ -42,7 +42,7 @@ fn try_join_all_iter_lifetime() {
         Box::new(try_join_all(iter))
     }
 
-    assert_done(|| sizes(vec![&[1,2,3], &[], &[0]]), Ok(vec![3 as usize, 0, 1]));
+    assert_done(|| sizes(vec![&[1,2,3], &[], &[0]]), Ok(vec![3_usize, 0, 1]));
 }
 
 #[test]