diff --git a/src/sabre_layout.rs b/src/sabre_layout.rs
index 0a0838482bf1..7065ef388b39 100644
--- a/src/sabre_layout.rs
+++ b/src/sabre_layout.rs
@@ -140,7 +140,7 @@ fn layout_trial(
                 neighbor_table,
                 distance_matrix,
                 heuristic,
-                seed,
+                Some(seed),
                 &mut pass_final_layout,
                 num_swap_trials,
                 Some(run_swap_in_parallel),
@@ -158,7 +158,7 @@ fn layout_trial(
         neighbor_table,
         distance_matrix,
         heuristic,
-        seed,
+        Some(seed),
         &mut final_layout,
         num_swap_trials,
         Some(run_swap_in_parallel),
diff --git a/src/sabre_swap/mod.rs b/src/sabre_swap/mod.rs
index 8e4d46485034..1b49103ab100 100644
--- a/src/sabre_swap/mod.rs
+++ b/src/sabre_swap/mod.rs
@@ -178,7 +178,7 @@ pub fn build_swap_map_inner(
     neighbor_table: &NeighborTable,
     dist: &ArrayView2<f64>,
     heuristic: &Heuristic,
-    seed: u64,
+    seed: Option<u64>,
     layout: &mut NLayout,
     num_trials: usize,
     run_in_parallel: Option<bool>,