Fix a doctest overflow
diff --git a/src/lib.rs b/src/lib.rs
index 50984dc..03840ac 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -841,8 +841,8 @@
 /// # Examples
 ///
 /// ```
-/// let x = rand::random();
-/// println!("{}", 2u8 * x);
+/// let x = rand::random::<u8>();
+/// println!("{}", x);
 ///
 /// let y = rand::random::<f64>();
 /// println!("{}", y);