diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 4f744b0b2dee..64582d047f70 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -521,7 +521,7 @@ mod tests {
     #[test]
     fn show_arc() {
         let a = Arc::new(5u32);
-        assert!(format!("{}", a).as_slice() == "5")
+        assert!(format!("{}", a) == "5")
     }
 
     // Make sure deriving works with Arc<T>
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index 000dda59e3dd..14ab45c9c01a 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -169,14 +169,14 @@ mod test {
         let b = box Test as Box<Any>;
         let a_str = a.to_str();
         let b_str = b.to_str();
-        assert_eq!(a_str.as_slice(), "Box<Any>");
-        assert_eq!(b_str.as_slice(), "Box<Any>");
+        assert_eq!(a_str, "Box<Any>");
+        assert_eq!(b_str, "Box<Any>");
 
         let a = &8u as &Any;
         let b = &Test as &Any;
         let s = format!("{}", a);
-        assert_eq!(s.as_slice(), "&Any");
+        assert_eq!(s, "&Any");
         let s = format!("{}", b);
-        assert_eq!(s.as_slice(), "&Any");
+        assert_eq!(s, "&Any");
     }
 }