diff --git a/src/bin/day23.rs b/src/bin/day23.rs
index dd392b5..48bbbda 100644
--- a/src/bin/day23.rs
+++ b/src/bin/day23.rs
@@ -133,11 +133,9 @@ impl Day23 {
             let distance = missing.then(|| {
                 edges
                     .iter()
-                    .filter_map(|e| {
-                        (e.start == u).then(|| {
-                            e.distance as isize
-                                + longest_path(cache, edges, goal, e.end, visited | u)
-                        })
+                    .filter(|&e| e.start == u)
+                    .map(|e| {
+                        e.distance as isize + longest_path(cache, edges, goal, e.end, visited | u)
                     })
                     .max()
                     .unwrap()