diff --git a/2025/src/day09.clj b/2025/src/day09.clj
index 023eb79..6e6ba00 100644
--- a/2025/src/day09.clj
+++ b/2025/src/day09.clj
@@ -33,7 +33,7 @@
         o3 (orientation c d a)
         o4 (orientation c d b)]
     (and (not= o1 o2) (not= o3 o4))))
-(def line-segments (map vector input (conj (vec (rest input)) (first input))))
+(def line-segments (map vector input (rest input)))
 
 ;; part 2
 (->> largest-squares