2 files changed, 2 insertions, 2 deletions
diff --git a/Cargo.lock b/Cargo.lock
index 827a9aa..23f8ba3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -516,7 +516,7 @@ checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
 
 [[package]]
 name = "embeddings-sort"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "ahash",
  "anyhow",
diff --git a/src/tsp_approx.rs b/src/tsp_approx.rs
index 2c6cbf9..e3448a1 100644
--- a/src/tsp_approx.rs
+++ b/src/tsp_approx.rs
@@ -292,7 +292,7 @@ fn refine_2_opt(dist_cache: &DistCache, tour: Vec<usize>) -> (bool, Vec<usize>)
     let mut tour: Vec<_> = tour
         .into_iter()
         .enumerate()
-        .map(|(i, v)| (i - 1, v, i + 1))
+        .map(|(i, v)| (i.wrapping_sub(1), v, i + 1))
         .collect();
     let n = tour.len();
     // fix boundary