diff --git a/instant-distance/benches/all.rs b/instant-distance/benches/all.rs
index 60b422b..a80d7dd 100644
--- a/instant-distance/benches/all.rs
+++ b/instant-distance/benches/all.rs
@@ -1,5 +1,5 @@
 use bencher::{benchmark_group, benchmark_main, Bencher};
-use rand::rngs::{StdRng, ThreadRng};
+use rand::rngs::StdRng;
 use rand::{Rng, SeedableRng};
 
 use instant_distance::Builder;
@@ -8,16 +8,17 @@ benchmark_main!(benches);
 benchmark_group!(benches, build_heuristic);
 
 fn build_heuristic(bench: &mut Bencher) {
-    let seed = ThreadRng::default().gen::<u64>();
-    let mut rng = StdRng::seed_from_u64(seed);
+    let mut rng = StdRng::seed_from_u64(SEED);
     let points = (0..1024)
         .into_iter()
         .map(|_| Point(rng.gen(), rng.gen()))
         .collect::<Vec<_>>();
 
-    bench.iter(|| Builder::default().seed(seed).build_hnsw(points.clone()))
+    bench.iter(|| Builder::default().seed(SEED).build_hnsw(points.clone()))
 }
 
+const SEED: u64 = 123456789;
+
 /*
 fn randomized(builder: Builder) -> (u64, usize) {
     let query = Point(rng.gen(), rng.gen());