diff --git a/Cargo.toml b/Cargo.toml
index 2c471fa..4a42706 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,8 +16,16 @@ edition = "2018"
 [package.metadata.docs.rs]
 features = ["std", "num-bigint-std", "serde"]
 
+[[bench]]
+name = "bigrational"
+
 [dependencies]
 
+[dependencies.rand]
+optional = true
+version = "0.8"
+default-features = false
+
 [dependencies.num-bigint]
 optional = true
 version = "0.4.0"
diff --git a/benches/bigrational.rs b/benches/bigrational.rs
index 4a1ee3b..37e7a42 100644
--- a/benches/bigrational.rs
+++ b/benches/bigrational.rs
@@ -4,58 +4,29 @@ extern crate test;
 
 use num_bigint::BigInt;
 use num_rational::{BigRational, Ratio};
-// use num_traits::{FromPrimitive, Num, One, Zero};
 use test::Bencher;
 
 mod rng;
 use rng::get_rng;
 
-// allocating 'a' and 'b' is about 70ns.
-// allocating BigRational(a,b) is about 970ns.
-fn alloc_bench(b: &mut Bencher) {
+#[bench]
+fn alloc_ratio_bigint_bench(b: &mut Bencher) {
     use rand::RngCore;
     let mut rng = get_rng();
     b.iter(|| {
         let a = BigInt::from(rng.next_u64());
         let b = BigInt::from(rng.next_u64());
         BigRational::new(a, b)
-        // (a, b)
-    });
-}
-
-fn alloc_fast_bench(b: &mut Bencher) {
-    use rand::RngCore;
-    let mut rng = get_rng();
-    b.iter(|| {
-        let a = BigInt::from(rng.next_u64());
-        let b = BigInt::from(rng.next_u64());
-        BigRational::new_fast(a, b)
-        // (a, b)
     });
 }
 
-fn alloc_u64_bench(b: &mut Bencher) {
+#[bench]
+fn alloc_ratio_u64_bench(b: &mut Bencher) {
     use rand::RngCore;
     let mut rng = get_rng();
     b.iter(|| {
         let a = rng.next_u64();
         let b = rng.next_u64();
-        Ratio::new_fast(a, b)
-        // (a, b)
+        Ratio::new(a, b)
     });
 }
-
-#[bench]
-fn alloc_0(b: &mut Bencher) {
-    alloc_bench(b);
-}
-
-#[bench]
-fn alloc_fast_0(b: &mut Bencher) {
-    alloc_fast_bench(b);
-}
-
-#[bench]
-fn alloc_u64_0(b: &mut Bencher) {
-    alloc_u64_bench(b);
-}